# Optical Instrument MCQs For NEET

NEET  Physics is the scoring paper in the medical entrance examination. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Physics Optical Instrument Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.

## 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: (b) Converging (or convex) lens

2. The diameter of a lens is called
(a) Focal length
(b) Principle axis
(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: (b) Bent away from the normal

4. The power of a concave lens is
(a) Real
(b) Virtual
(c) Positive
(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: (b) Increases with the decrease in focal length

6. Magnification of astronomical telescope is
(a) f0 + fe
(b) f0/fe
(c) fe/f0
(d) (1+f0/fe)L/f0

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

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: (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