Light in General Science : Practice MCQ Questions & Answers with Explanations

In a plane mirror, the object and its image always remain at the same distance from the mirror. So, when the car reverses at a speed of 2 m/s, then the image will also appear to move towards the mirror at the same speed of 2 m/s. So, the speed at which the image of truck appears to approach the car driver will be 2 m/s + 2 m/s = 4 m/s

In the case of a plane mirror, the distance between the object and the mirror (d1) is same as the distance between the image and the mirror (d2).

Distance between the mirror and David's image, d2 = 4 m

Therefore, d1 = d2 = 4 m

If David moves 1 m towards the mirror, then d1 = 4 − 1 = 3 m

Again, d1 = d2 = 3 m

Therefore, the distance between David and his image is d1 + d2 = 3 + 3 = 6 m.

Concave mirror forms virtual and enlarged image of the object when the object is placed close to it. Concave lens and convex mirror form virtual but diminished image of the object. Plane mirror forms virtual and same sized image of the object.

virtual

regular

half the radius of curvature

reflection of light

5 degree

luminous object

Moon

virtual, erect and diminished