Question

Figure shows a point source of lights S, a convex lens
L and a plane mirror M. The three are placed
such that rays of light from S return to it after
reflection from M. Complete the ray diagram.
What is the distance called ?
To which point [left of S, on S or right of S] will
the rays return if M is moved to the left and
brought in contact with L?​

Answer 1

Answer:

The distance between S and lens is known as focal length

There is no change in the position of S when we move the mirror to the left

Explanation:

Here we can see that light becomes parallel to principle axis after passing through the lens

So we will have

$\frac{1}{d_i} + \frac{1}{d_o} = \frac{1}{f}$

here we know that

$d_i = infinite$

so we have

$d_o = F$

So the distance between Point S and the lens is Focal length

Now the light will strike the mirror perpendicularly and return to its path to same point S

so there is no change in the position of image when we shift the mirror to the left

Position of S will remain the same

#Learn

Topic : Lens

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