CLASS 10 CHAPTER 10 OBJECTIVE QUESTION ON LENS

1.      WHAT IS THE UNIT OF LENS POWER

A.     METER                    B. DIPTEROUS                  C. CM                     D WATT

2.      ARRANGE DECREASING ORDER OF REACTIVE INDEX OF WATER ,AIR , GLASS AND DIAMOND

A.     WATER >AIR >GLASS > DIAMOND

B.     WATER>GLASS >AIR >DIAMOND

C.     DIAMOND > GLASS>WATER>AIR

D.     DIAMOND >WATER> GLASS>AIR

3.      AN OBJECT 25 CM HIGH IS PLACED IN FRONT OF A CONVEX LENS OF FOCAL LENGTH 30 CM .IF THE HEIGHT OF IMAGE FORMED IS 50 CM , FIND THE DISTANCE BETWEEN OBJECT DISTANCE AND IMAGE DISTANCE

A.     30 CM              B.15 CM                  C.60 CM                                 D. NONE OF THESE

4.      WHICH LENS HAVE NEGATIVE FOCAL LENGTH

a.      Convex lens     b. concave lens        c. concave mirror          d. none of these

5.      If focal length of two  lens  are 10 cm , 20 cm  then find combined focal length

a.      30 cm                b. 20 cm                     c. 6.66  cm               d. none of these

6.      An object is placed at a distant of 1.50 m from a screen and a convex lens placed in

between produces an image magnified 4  time on the screen . what is the focal and

 the position of the lens

a.      0.24 cm and 0.3 m

b.     0.4 cm and 0.24 m

c.      3 cm and 0.3 m

d.     None of these

7.      An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm

.position of image is

a.      16.7 cm                 b. 17 cm                    c.18  cm                       d.19 cm

8.      Which lens always form erect image

a.      Concave lens       b. convex lens         c. mirror               d. none of these

9.      Define power of lens ?

10.   what plane mirror ?

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