White light is incident normally on a glass plate in air of thickness and refractive index

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

White light is incident normally on a glass plate in air of thickness

500\text{ nm}

and refractive index

1.5

. The wavelength in the visible region,

400\text{ nm}

700\text{ nm}

, that is strongly reflected by the plate is (1)

450\text{ nm}

(2)

600\text{ nm}

(3)

400\text{ nm}

(4)

500\text{ nm}