Question

Rakesh projects a beam of light from different angles on a lens placed perpendicular to the table. The beams of light passing through this lens turn at different angles but a ray of light from one place on the lens does not turn even after passing through the lens.Where is this beam of light being projected from? Draw a figure of the rays​

Answer 1

Correct option is B)

If mirror is rotated by angle θ

angle of refrection is 2θ

tan2θ=

x

y

2θ=y/x

θ=y/2x

solution

Answer 2

Answer:

If mirror is rotated by angle 0 tan20=

angle of refrection is 20

X

y

20=y/x

0=y/2x

solution