A point source of light is placed on the principal axis between F and 2F of a concave lens. On the other very far , a screen is placed perpendicular t

Question

A point source of light is placed on the principal axis between F and 2F of a concave lens. On the other very far , a screen is placed perpendicular t

A point source of light is placed on the principal axis between F and 2F of a concave lens. On the other very far , a screen is placed perpendicular to principal axis. As the screen is brought close towards lens
A. the light intensity on screen continuously decreases
B. the light intensity on screen continuously increases
C. the light intensity on screen first increases, then decreases
D. the light intensity on screen first decreases, then increases

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
Concave lens behaves as divergent lens and diverges the beam of light as passes from lens . When the screen is brought close towards lens it receive more number of rays hence light intensity increases.

6 views Answered 2023-02-05 15:29