Chapter 10: Light: Mirrors and Lenses - Solutions
Light: Mirrors and Lenses Solutions Light: Mirrors and Lenses - Solutions Question 1 A light ray is incident on a mirror and gets reflected by it (Fig. 10.21). The angle made by the incident ray with the normal to the mirror is 40°. What is the angle made by the reflected ray with the mirror? (i) 40° (ii) 50° (iii) 45° (iv) 60° Answer: (ii) 50° Explanation & Formula: Angle of incidence ( i ) = 40°. According to the law of reflection, Angle of reflection ( r ) = Angle of incidence ( i ) = 40°.
Angle between reflected ray and mirror = 90° − angle of reflection
= 90° − 40°
= 50°
Question 2 Fig. 10.22 shows three different situations where a light ray falls on a mirror: (i) The light ray falls along the normal. (ii) The mirror is tilted, but the light ray still falls along the normal to the tilted surface. (iii) The mirror is tilted, and the light ray falls at an angle of 20° from the normal. Draw the reflected ray in each case (Use a ruler and protractor for acc…
