Secondary rainbow is formed due to double internal reflection and is formed above the primary rainbow. The secondary rainbow is brighter than the primary rainbow.
During a cloudy day, a primary and a secondary rainbow may be created, then the:
Held on 30 Apr 2022 · Verified 9 Jul 2026.
primary rainbow is due to double internal reflection and is formed above the secondary one.
primary rainbow is due to double internal reflection and is formed below the secondary one.
secondary rainbow is due to double internal reflection and is formed above the primary one.
secondary rainbow is due to single internal reflection and is formed above the primary one.
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The refractive index of glass is 1.5. The speed of light in glass is:
Two thin lenses of focal lengths f₁ = +20 cm and f₂ = -10 cm are in contact. The power of the combination is:
An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then -
A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the distance of distinct vision of eye is 25 cm , the magnification in the microscope is :
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from the polarization axis of one of the polaroid, is ( $\mathrm{I}_0$ is the intensity of polarised light after passing through the first polaroid):
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