Q). Study the given Ray diagrams and identify the devices 'X' and 'Y'. Also find the focal length of the devices.

Dear student,
Device X is a convex lens and device Y is a concave mirror whose focal lengths are 20 cm and 25 cm, respectively.
Reason being a parallel ray of light incident on a concave 
mirror gets reflected, and the image is seen on a screen placed before it which is seen in case of Y. A parallel ray of light incident on a convex lens converges to a point which is seen in case of X.
Regards

 

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X is convex lens of focal length 20 cm & Y is concave mirror of focal length 25 cm.
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