300+ TOP MCQs on Optical Instrument and Answers

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MCQs on Optical Instrument :

1. A lens which converges a beam of parallel rays to a point is called
(A) Diverging (or concave) lens
(B) Converging (or convex) lens
(C) Plano concave lens
(D) Plano-convex lens

Answer

Answer: (B) Converging (or convex) lens

2. The diameter of a lens is called
(A) Focal length
(B) Principle axis
(C) Aperture
(D) Radius of curvature

Answer

Answer: (C) Aperture

3. In going from a denser to rarer medium a ray of light is
(A) Undeviated
(B) Bent away from the normal
(C) Bent towards the normal
(D) polarised

Answer

Answer: (B) Bent away from the normal

4. The power of a concave lens is
(A) Real
(B) Virtual
(C) Positive
(D) negative

Answer

Answer: (D) negative

5. Magnifying power of a simple microscope
(A) Increases with increase in focal length
(B) Increases with the decrease in focal length
(C) No effect with decrease or increase with the focal length
(D) Least distance of distinct vision

Answer

Answer: (B) Increases with the decrease in focal length

6. Magnification of astronomical telescope is
(A) f₀ + f_e
(B) f₀/f_e
(C) f_e/f₀
(D) (1+f₀/f_e)L/f₀

Answer

Answer: (B) f₀/f_e

7. The magnifying power of an astronomical telescope is 10 and the focal length of its eye-piece is 20 cm. The focal length of its objective will be
(A) 200 cm
(B) 2 cm
(C) 0.5 cm
(D) 0.5 x 10^–2 cm

Answer

Answer: (A) 200 cm

8. The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eye-piece is found to be 20 cm. The focal lengths of the lenses are
(A) 18 cm, 2 cm
(B) 11 cm, 9 cm
(C) 10 cm, 10 cm
(D) 15 cm, 5 cm

Answer

Answer: (A) 18 cm, 2 cm

9. In a compound microscope, magnifying power is 95 and the distance of the object from the objective lens is 1/38 cm. The focal length of the objective lens ¼ cm. What is the magnification of eyepiece?
(A) 5
(B) 10
(C) 100
(D) 200

Answer

Answer: (A) 5

10. A hypermetropic person having “near point” at a distance of 0.75 m puts on spectacles of power 2.5 D. The “near point” now is at
(A) 0.75 m
(B) 0.83 m
(C) 0.26 cm
(D) 0.26 m

Answer

Answer: (D) 0.26 m