Simple Microscope Numerical Class-12 Nootan ISC Physics Solution Ch-18 Optical Instruments. Step by step solutions of Kumar and Mittal Physics of Nageen Prakashan as council latest prescribe guideline for upcoming exam. Visit official Website  CISCE for detail information about ISC Board Class-12 Physics.

Simple Microscope Numerical Class-12 Nootan ISC Physics Solution Ch-18 Optical Instruments

Board	ISC
Class	12
Subject	Physics
Book	Nootan
Chapter-18	Optical Instruments
Topics	Numericals on Simple Microscope
Academic Session	2025-2026

Numericals on Simple Microscope

Simple Microscope Numerical Class-12 Nootan ISC Physics Solution Ch-18 Optical Instruments.

Que-1. What are the two possible values of the magnifying power of a simple microscope made of a convex lens of focal length, f = 2.5 cm?

Ans- Two possible values are

1 + D/fe  and  D/fe

=> 1 + 25/2.5   and 25/2.5

=> 11 ,10

Que-2. A magnifying glass has a magnifying power of 50 when the image is formed at the least distance of distinct vision (25 cm). What is its focal length?

Ans- m= 1 +D/f

=> 50 = 1 + 25/f

=> f = 25/49 = 0.51 cm

Que-3. A man whose least distance of distinct vision is 24 cm, uses a convex lens of focal length 1.2 cm as a magnifying glass. What magnifying power does he obtain?

Ans- m= 1 +D/fe = 1 + 24/1.2

= 1 + 20 = 21

Que-4. A person having normal near point (25 cm) reads a book through a magnifying glass of focal length 5 cm. What are the nearest and farthest distances at which he can put the book before him? What are the maximum and the minimum angular magnifications (magnifying powers) possible with this simple microscope?

Ans- magnifying power at D

= 1 +D/fe = 1 + 25/5 = 6 cm

∴ nearest distance to see = 25/6 = 4.2 cm

and magnifying power at ∞

∴ farthest distance = 25/5 = 5 cm

–: Simple Microscope Numerical Class-12 Nootan ISC Physics Solution Ch-18 Optical Instruments. :–

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