Question

A parallel beam of light fall successively on two lens in two case and finally illuminate screen. Area illuminated by the beam of light on the screen which passes through two lens in case – 1 and case – 2 is A₁ and A₂ respectively. ThenA₁ : A₂ is [aperture of second lens is 1 cm in bothcase] –

• A. 81 : 1
• B. 1 : 81
• C. 1 : 9
• D. 9 : 1

Answer 1

Answer: (B)

1 : 81

Answer 2