Worksheet CBSE Class 10 Light

SCIENCE worksheet – Class X Chapter - Light

1.

What are the differences between real image and virtual image?

2.

The radius of curvature of a concave mirror is -24cm.What is its focal length?

3.

How will you identify a lane mirror! a concave mirror and a conve" mirror without touching their surface?

4.

Which mirror has a wider field field of view? Where is it used?

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What haens to a ray of light when it travels from a rarer medium to a denser medium?

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What will be the signs of u! v and f for a conve" lens as er sign convention?

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&tate &nell's law of refraction.

(.  ) lens lens always forms a diminished! erect and virtual image. *dentify *dentify the nature of the lens. +.

Where should an ob,ect be laced so that a real and inverted image of the same sie is formed using a conve" lens?

1. How is the ower of a lens related to its focal length? 11.. What is the & * unit of ower of a lens? /efine it. 11 12. Two lenses having ower 01 and 02 are laced in contact. What is the net ower of the combination? 13. Two Two lens lenses es of owers owers 4/ and and -#/ -#/ are et in conta contact ct.. ind ind the the foca focall leng length th of the the combination. What is the nature of the combination? 14. What do you understand by the term refractive inde"? /efine it.

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1#. The image of our face is viewed in and out of the curved surface of a soon. What change in the image is observed? How will you e"lain this? 1$. ou should not loo at the sun directly or even into a mirror reflecting the light from the sun. ustify. 1%. ou need an erect and enlarged image of on ob,ect on a mirror. Which mirror would you choose? 1(. ou need to get an image of the sie as that of the ob,ect using a lens. What is the suitable lens to be used? 1+. The image of an ob,ect at a distance of 2 cm from a mirror is formed at the ob,ect itself. 15 *dentify the mirror

25 The nature of the image

35 sie of the image

45 the focal length of the mirror

#5 radius of curvature of the mirror /raw the corresonding ray diagram. 2.  ) conve" mirror used on an automobile has radius of curvature of 2 m .*f a car is located at 4 m from the mirror! find the osition nature and sie of the image 21. Why is conve" mirror referred to be used as a driver's rear-view mirror? 22. or what osition of an ob,ect! a virtual image is formed by a conve" lens? /raw a ray diagram to show the formation of a virtual image by a conve" lens. What are the other  characteristics of the image? 23. Why is a concave lens is called diverging lens! whereas a conve" lens a converging lens? 6"lain with the hel of ray diagrams. 24. 7ive two uses of a5 conve" lens b5 conve" mirror  c5 concave mirror d5concave lens 2#. &how the ath of a ray of light through a rectangular glass slab. 8abel incident ray! refracted ray! emergent ray! the angle of incidence and angle of emergence and lateral dislacement. Why is angle of incidence e9ual to the angle of emergence? 2

2$. &tate three rules for drawing geometric images in concave lens. 2%.  ) reflected ray of light from a mirror maes an angle of +  with the incident ray of light. What are the angle of incidence and the angle of reflection? 2(. &tate the laws of refraction. 2+. )n ob,ect 4cm high is laced 1#cm away from a concave lens of focal length 1cm. /raw a ray diagram and find the osition! sie and nature of the image formed. 3. )n ob,ect is et in front of a concave mirror of focal length 2cm.The image formed is three times the sie of the ob,ect. :alculate the two ossible distances of the ob,ect from the mirror. 31. )n ob,ect .4m high is laced at a distance of .(m from a co ncave mirror of radius curvature .4m. ind the osition! nature and sie of the image formed? 32. Two thin converging lenses of focal length 1#cm and 3cm are held in contact with each other. :alculate the ower and focal length of combination. 33. ind the osition of an ob,ect which when laced in front of a concave mirror of focal length 2cm! roduces a virtual image! which is twice the sie of the ob,ect. 34. /raw a ray diagram to show the formation of an ob,ect laced between the ole and focus of  a concave mirror. 3#. What is a lens? /istinguish between a conve" and concave lens. 3$. What do you understand by the ower of a lens? /efine magnification in case of sherical mirror and lens. ;ention the new :artesian sign convention alicable to in this case. 3%. /raw a ray diagram to show the formation of the image of an ob,ect laced between otical centre and focus of a conve" lens. 3(. ou are re9uired to obtain an erect image of an ob,ect laced in front of a concave mirror of  focal length 1#cm.What should be the aro"imate distance of the ob,ect from the ole of the mirror? What is the nature of the image? *s the image larger of smaller in sie than the ob,ect? /raw a ray diagram to show the formation of image. 3+. )n ob,ect of sie #cm is laced at a distance of 2#cm from the ole of a concave mirror of  3

radius of curvature 3cm.:alculate the distance and sie of the image so formed. What will be the nature of the image? 4. )n ob,ect of sie 3cm is laced at a distance of 1#cm from a conve" lens of focal length 1cm.:alculate the distance and sie of the image so formed. What will be the nature of the image? 41. /etermine the seed of light in glass which has refractive inde" of 1.#! if the seed of light in vacuum is 3"1(m .When a ray of light travels obli9uely from ) into > the reflected ray bends away from the normal. Which of the media ) and > is otically denser and why? 4#. ) conve" lens has a focal length of #cm. :alculate its ower. 4$. *dentify the lens
ocal length negative iii5 0ower ositive iv5 0ower negative v5

orms virtual image always magnified

vi5 orms only diminished virtual images vii5 ;agnification always ositive

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viii5 ;agnification always less than one i"5 :an roduce image of the same sie "5

orms real oint sied image

"i5 orms virtual oint sied image "ii5 sed as shaving mirror "iii5 sed as rear view mirror "iv5 Have wide field of view "v5 :onverges the incident rays "vi5 /iverges the incident rays

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