Ray Optics – 1 – 2

6. The spherical mirror formula is written as :

(a) (1/v) – (1/u) = 1/f
(b) 1/f = 1/(f + v)
(c) (1/v) + (1/u) = 1/f
(d) f = R/2

ANSWER

EXPLANATION

7. The final image formed by an terrestrial telescope is :

(a) Erect
(b) Inverted
(c) Sometimes erect, sometimes inverted
(d) None of these

ANSWER

EXPLANATION

8. The magnifying power of an telescope can be increased by using :

(a) Eye lens of large focal length
(b) Objective of large focal length
(c) Objective of short focal length
(d) None of these

ANSWER

EXPLANATION

9. The unit of Power of a lens is :

(a) centimetre 
(b) metre
(c) dioptre

(d) lux

ANSWER

EXPLANATION

10. A Lens of Power of -2.5 D, Then its focal length will be :

(a) 0.4 m
(b) -0.4 m
(c) 0.2 m
(d) -0.2 m

ANSWER

EXPLANATION

1 2 3

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