Light mirrors and lenses crossword answers

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Light mirrors and lenses crossword answers

SCIENCE 8 REFLECTION, REFRACTION, MIRRORS & LENSES CROSSWORD NAME: Unscramble the shaded letters to find the name of the man who placed a mirror on the Moon so that scientists can measure its distance from the Earth: Across Down 1. The angle formed by the incident ray and the normal 2. The light rays produced by a #20 across mirror 3. When looking through any type of mirror, the left-right orientation is always . 3. The angle formed by the reflected ray and the normal 4. The angle of the ray of light measured between the refracted ray and the normal 7. Type of material that only allows some scattered light to be transmitted 5. The ray that bounces off the barrier 9. A mirror that curves outwards 6. Images formed by # 19 across lenses are always smaller and . 10. Type of mirror that produces images the same size as the object 8. The point at which converging light rays meet or from which light rays diverge 11. Type of material that allows all light to be #11 across 11. Light rays pass straight through a material 12. If light rays enter a material of greater density, they . 14. If the object is near a concave mirror, the image will appear . 13. The light rays produced by a #9 down mirror 15. Objects more than one focal length from a convex lens will appear . 18. If light rays enter a material of lesser density, they . 16. A piece of curved transparent material that refracts light rays as they pass through it 19. A lens that is thicker in the middle and thinner at the edges 17. The focal is the distance from the center of the lens to where they converge. 21. If light rays #18 down as they refract, they bend the normal 18. The result of an object blocking the light rays striking the object 23. Light rays become trapped in a material 19. A lens that is thinner in the middle and thicker at the edges 25. Type of material that allows all light to be #23 down or reflected 20. A mirror that curves inwards 22. The incoming ray 24. If light rays #12 down as they refract, they bend the normal 26. An illusion produced by the refraction of light through air of different densities 27. An imaginary line perpendicular to a reflecting or refracting surface 28. Images formed by # 9 down mirrors are always . In this page we have Light worksheet for Class 7 Science . Hope you like them and do not forget to like , social share and comment at the end of the page. Question 1 Fill the blanks: The property by which light in the straight line is termed as_______________________ Light travels with a speed of ______________________________km/s in air. The splitting of white light into its seven constituent colours is called________________ _____________________is the study of spectrum formed when a surface emits light. _____________________was the first person who discovered that sunlight is made up of seven colours. _____________________lens is present in human eye. A ____________________ lens always forms an erect, virtual and diminished image. Question 2 Answer the following questions ? Differentiate between the following (3 points each) a) Concave and convex mirror. b) Real and virtual image. Define a) Mirror b) lens c) prism d) rainbow e) lateral inversion Which mirror is used as rear views mirror and why? Why is it dangerous to look at the sun through a convex lens? What is a Newton's disc? How does it show that light is composed of many colours? Why is concave mirror used in search lights & head lights? Question 3 True and false a. Light is the fastest travelling form of energy b. Light travels in curve path c. As per law of reflection, Angle of Incidence = Angle of Reflections d. A concave lens can be used to produce an enlarged and erect image. e. An object can be seen only if it emits light f. A concave lens is called the converging lens Question 4 Fill in the blanks a. The inner surface of a spoon acts like a ________ while its outer surface acts like a _________________ b. An image formed on a screen is called a _______ c. _______mirrors used as side mirrors in scooters /cars d. The lenses which feel thicker in the middle than at the edges are _________ e. The seven colours in rainbow are red, orange, yellow, green, blue, ______ and ________ Question 5 Multiple Choice questions i. John and Tom were given one mirror each by their teacher. Tom found his image to be erect and of the same size whereas John found her image erect and smaller in size. This means that the mirrors of John and tom are, respectively (a) plane mirror and concave mirror. (b) concave mirror and convex mirror. (c) plane mirror and convex mirror. (d) convex mirror and plane mirror ii. You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image rom (a) both concave lens and convex lens. (b) both concave mirror and convex mirror. (c) both concave mirror and convex lens. (d) both convex mirror and concave lens. Question 6 Unscrambled the Jumbled word a. EALICHPSR b. ISRPM c. NNOARIW d. RVINTDEE e. CERTE Question 7 Crossword Puzzle Across 4. A convex lens is _____ lens 6. An image which can be obtained on a screen Down 1. A concave lens is _____ lens 2. An image which cannot be obtained on a screen 3. Any polished or a shining surface acts as a _______ 5. One of the rainbows colours Answer 1 a. Rectilinear propagation b. 3 X 108 m/s c. dispersion d. Spectroscopy e. Sir Issac Newton f. Convex g. Concave Answer 3 a. True b. False c. True d. False e. False f. False Answer 4 a. Concave mirror and convex mirror b. real image c. Convex d. Convex lens e. indigo and violet Answer 5 i. (d) ii. (c) Answer 6 a. Spherical b. Prism c. Rainbow d. inverted e. erect Answer 7 1. diverging 2.virtual 3.mirror 4.converging 5.orange 6. real link to this page by copying the following textWorksheet for Light Class 7 Science Chapter 15 Also Read Class 7 Maths Class 7 Science Thank you for your participation! A type of optical telescope that uses a lens as its objective to form an image. refracting Is an optical telescope which uses curved mirrors that reflect light and form an image. reflecting The _____lens in a telescope focuses the light to a point in front of the eyepiece. objective Another word for nearsightedness myopia Images are formed behind the retina, not on it, and this causes close-up images to be blurry. hyperopia The most common cause of blindness cataracts The pupil gets____in bright light. smaller The aqueous humour is the ____fluid, that fills the front part of the eyeball. clear The ___ spot is where the optic nerve leaves the retina. blind The coloured part of the eye. iris The _____body is a circular muscle that enables the lens to change shape for focusing. ciliary The _____is a layer of blood vessels that nourishes the eye. choroid With refraction of light no image is formed when the object is at the_____point. focal A lens that makes light rays come together is called a _____lens. convex These lenses make light spread apart. concave A _____and dark-coloured surface will absorb light the most. rough Concave mirrors are also called _________mirrors converging Your image will be upright, but much smaller than what you normally see in this kind of mirror. plane The ability to let light rays in. transparent Light can partially get through.. translucent Allows no light to get through. Opaque ,Light can travel in a straight line just like _____. waves When the sunlight passes from the air through rain droplets before reaching your eyes, what is this called? dispersion Different _______of light have different wavelengths. colours Where does the energy of the electromagnetic spectrum come from? sun ,As the wavelength gets shorter, both the frequency and energy _______. increase Which rays are the highest forms of electromagnetic radiation? gamma Waves where the particles of the medium vibrate with an up and down motion. transverse What is the branch of science called that deals with the study of waves that travel through the Earth? seismology What kind of wave can you see on the water on a windy day? surface Page 2the bouncing of light off an object REFLECTION the bending of the path of light when it moves from one kind of matter to another REFRACTION the stopping of light when it his a wall or other opaque ABSORBTION reflecting or absorbing all light; no image can be seen OPAQUE allowing some light to pass through; blurry image can be seen TRANSLUCENT allows most light to pass through; clear image can be seen TRANSPARENT a solid object that bends light; not a lens PRISM the range of light energy that people can see VISIBLE SPECTRUM a vibration you can hear SOUND the area of a sound wave where the air is pushed together COMPRESSION quickly moving areas of high and low pressure SOUND WAVE the greatest distance from the top of a sound wave to the bottom of the wave, the more energy a wave carries, the greater the amplitude AMPLITUDE the distance in a straight line from one place on a ripple to the same place on the next ripple WAVELENGTH the measure of the amount of sound energy reaching your ears LOUDNESS the measure of how high or low the sound is PITCH the speed t which a sound travels SPEED OF SOUND a sound reflection ECHO a large, quick air pressure increase followed by a large quick decrease, an object moving faster than the speed of sound does this, so we hear a large BOOM when it happens SONIC BOOM the change in frequency & pitch as a source of sound waves moving towards you or away you DOPPLER EFFECT the part of a sound wave where molecules are spread apart RAREFACTION the part of the sound wave where the molecules are close together COMPRESSION the number of times an object vibrates per second FREQUENCY a unit for measuring loudness DECIBEL Similar Questions Asked By Users You're Reading a Free Preview Pages 5 to 7 are not shown in this preview.

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