A parallel beam of light falls axially o...

A parallel beam of light falls axially on a thin converging lens of focal length 20cm. The emergent light falls on a screen placed 30cm beyond the lens. An opaque plate with a triangular aperture, side 1 cm, is in contact with the lens
Which one of the following diagrams best shows to appearance of the patch of light seen on the screen?

Text Solution

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The correct Answer is:

The image on the screen is real and inverted.
The size of the image on the screen has aperture size given by
Size`=1.0((10)/(20))=0.5cm`
Hence, the path of light on the screen is best represented by diagram (d).

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