⚛️ Physics · Ray Optics and Optical Instruments · NEET & JEE

A magnifying glass (simple microscope) has focal length 5 cm. Its magnifying power when the final image is at the near point (25 cm) is:

Answer: 6.

A 5
B 4
C 6
D 25

Correct answer: C. 6

Explanation: For image at the near point, magnifying power m = 1 + D/f = 1 + 25/5 = 6.

Concave mirror ray diagram with an object drawn as a candle on the principal axis, the focal point F marked, and the parallel ray and focal ray reflecting to form an inverted real image

Concave mirror ray construction: a ray parallel to the axis reflects through F, and a ray through F reflects parallel, locating the inverted real image. Image: Maxmath12, CC0, via Wikimedia Commons.

Concept context

Reflection, refraction, lenses, mirrors, total internal reflection.

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A magnifying glass (simple microscope) has focal length 5 cm. Its magnifying power when the final image is at the near point (25 cm) is:

Concept context

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