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

Total deviation produced by two mirrors at angle theta between them when light undergoes two reflections:

Answer: 180-2*theta.

A theta
B 180-theta
C 180-2*theta
D 2*(180-theta)

Correct answer: C. 180-2*theta

Explanation: Total deviation = 180 - 2*theta (where theta is angle between mirrors). For parallel mirrors (theta=0), deviation = 180 degrees.

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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Total deviation produced by two mirrors at angle theta between them when light undergoes two reflections:

Concept context

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