High-quality camera lenses are often coated to prevent reflection

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

Problem

High-quality camera lenses are often coated to prevent reflection. A lens has a refractive index of

1.72

and a coating has a refractive index of

1.31

. For near-normal incidence, the minimum thickness of coating that prevents reflection for a wavelength of

5.3\times10^{-7}\text{ m}

is: (1)

0.75\,\mu\text{m}

(2)

0.2\text{ mm}

(3)

0.1\,\mu\text{m}

(4)

1.75\text{ mm}