Light - Study Mode
[#441] A concave lens always forms an image which is
Correct Answer
(B) virtual and erect
[#442] The reflector of a search light is a
Correct Answer
(B) concave mirror
[#443] When white light, which is a mixture of seven colours, passes through a prism, why is it dispersed?
Correct Answer
(B) 7 colors of white light pass through Glass prism at different speeds
[#444] Consider the following statements. 1. Fibre optics is based on the principle of total internal reflection. 2. In an optical fibre communication system, power consumption is extremely low 3. Optical fibre communications are free from radio frequency interference. 4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre. Which of these statements are correct?
Correct Answer
(A) Only 1, 2 and 3
[#445] If the lens power of glass is +2 dioptre, its focal length will be
Correct Answer
(C) 50 cm