Question

what happens when parallel rays of light falls on the lens make some angle with the principal axis​

Answer 1

what happens when parallel rays of light falls on the lens make some angle with the principal axis

Given : parallel rays of light falls on the lens making an theta with the principal axis

Solutions : if the incident rays of light makes an angle theta with the principle axis the refracted rays will coincide on the focus approximately. Compared to rays on the principal axis, the focus will be aberrated with the largest aberrations being coma and astigmatism.

Answer 2

Answer:

With a spherical lens, the rays will be brought to an approximate focus. Compared to rays on the principal axis, the focus will be aberrated with the largest aberrations being coma and astigmatism.

Test this yourself with a magnifying glass and sunlight. First form an image of the sun in the usual way. Then tilt the lens and see how good the image is.

By Anjali Roy ✨❣️