Home›MPPSC Forest›State Forest Service Mains Exam›Section 'B': Forestry and General Science›UNIT-07: Physics›Light: Nature of light, reflection of light, laws of reflection, reflection from plane and curved surface, image formation by plane, convex and concave mirror, relation between focal length and radius of curvature, determination of focal length of concave mirror by single pin method, relation between u, v, f (numerical examples)›What should be the minimum length of a plane mirror to get a full

What should be the minimum length of a plane mirror to get a full image of a person of height 4 feet ?

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A.4 feet
B.6 feet
C.2 feetCorrect
D.1 feet
Explanation & Solution

Correct Answer: (C) 2 feet

To see a full image in a plane mirror, the minimum required length of the mirror must be exactly half of the person's height. Therefore, for a person of 4 feet height, the mirror length should be 2 feet.

हिंदी में प्रश्न एवं आदर्श उत्तर

किसी 4 फीट के व्यक्ति को अपना पूरा प्रतिबिंब देखने के लिए, समतल दर्पण की न्यूनतम लंबाई क्या होनी चाहिए ?

A.4 फीट
B.6 फीट
C.2 फीटसही
D.1 फीट

सही उत्तर: (C) 2 फीट

समतल दर्पण में किसी व्यक्ति को अपना पूरा प्रतिबिंब देखने के लिए दर्पण की न्यूनतम लंबाई व्यक्ति की लंबाई की आधी होनी चाहिए। अतः 4 फीट के व्यक्ति के लिए दर्पण की लंबाई 2 फीट होनी चाहिए।

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