Light - Study Mode

[#176] The lens-type commonly used for correcting presbyopia is . . . . . . . .
Correct Answer

(A) bifocal lens

[#177] What will be the focal length of a spherical mirror with radius of curvature R?
Correct Answer

(A) $$frac{R}{2}$$

[#178] Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?
Correct Answer

(A) The cloth completely absorbs red colour wavelength

[#179] Dentists use a concave mirror because the image built on it is . . . . . . . .
Correct Answer

(D) virtual and large

[#180] Diffusion of light in the atmosphere takes place due to
Correct Answer

(B) Dust particles