Class X NCERT Solution, MCQ's Study Notes, Q & A Chapter 10 – Light - Reflection and Refraction Q.1.Why does a light ray incident on a rectangular glass slab immersed in any medium emerge parallel to itself? Ans: The extent of bending of the ray of light at the opposite parallel faces AB (air-glass interface) and CD (glass-air interface) of the rectangular glass slab is equal and opposite. This is why the ray emerges parallel to the incident ray. OR, (The glass slab is rectangular and both sides of the glass slab have the same medium. The light refracts in such a way that incident and emergent rays are parallel.) Q.2.An object is placed at a distance of 10cm from a convex mirror of focal length of 15cm . Find the position and nature of the image Solution: Given : f = +15cm u = -10cm v = ?’ 1/ f = 1/u +1/v 1/15 = -1/10 + 1/v 1/15 + 1/10 = 1/v 1/v = 1/6 v = 6cm Position of the image: Since V is formed at a distance o
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