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MHT CET 2026 (18 Apr, Shift 1) · Optical Instruments & the Eye

Optical Instruments & the Eye question from MHT CET 2026 (18 Apr, Shift 1)

Q4MHT CET 2026 · 18 APR · SHIFT 1Medium

Optical Instruments & the Eye

A simple microscope is a combination of two lenses in contact. Their powers are $+20$ D and $-4$ D. The distance of distinct vision is $25$ cm. When seen through the microscope, the size of the image of an object $3$ mm high is

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Answer: (b)

Lenses in contact: $P = 20 - 4 = 16$ D, so $f = \dfrac{100}{16} = 6.25$ cm.
Image at near point: $M = 1 + \dfrac{D}{f} = 1 + \dfrac{25}{6.25} = 5$ .
Image size $= 5 \times 3$ mm $= 15$ mm.
So the answer is (b) 1.5 cm.

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