HARD
10th Foundation
IMPORTANT
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Two plane mirrors A and B are aligned parallel to each other as shown in the figure. A light ray is incident at an angle 30° at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one), before it emerges out, is:

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Important Questions on Light-Reflection and Refraction

HARD
10th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 10>Chapter 9 - Light-Reflection and Refraction>EXERCISES>Q 19

A mirror is broken into two parts and these parts are separated by a distance of 1 cm as shown in figure. The focal length of the mirror is 10 cm the height of the images (in cm with respect to their optic axis), formed by the two parts of mirror when the object is midway between the two principal axes are:

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HARD
10th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 10>Chapter 9 - Light-Reflection and Refraction>EXERCISES>Q 20
A ray of light travels from a medium of refractive index n into air. If the angle of incidence at the plane surface of separation is θ and the corresponding angle of deviation is δ, the variation of δ with θ is shown correctly in the figure: