An observer can see a rainbow only when his back is towards the sun. The sunlight from his back falls on water droplets suspended in the air in front of her. It is refracted inside it and different colours of white light get separated due to refraction. These different rays strike the inner surface of the droplet and reflected if the angle of incidence is greater than the critical angle(nearly equal to 48∘). This reflected ray is again refracted into the air. Hence, rainbow formation is a combination of dispersion, refraction and reflection of light.
Pick the wrong answer in the context with rainbow.
NEET UG 2019 — Physics Optics
2019mcqeasy
Pick the wrong answer in the context with rainbow.
Official previous-year question
Held on 30 Apr 2019 · Verified 9 Jul 2026.
Options
- A
When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
- B
The order of colours is reversed in the secondary rainbow.
- C
An observer can see a rainbow when his front is towards the sun.
- D
Rainbow is a combined effect of dispersion, refraction and reflection of sunlight.
Did you get this right?
Sign in to track your attempts and accuracy.
Your note
Sign in to keep a private note on this question. Nothing you write is ever public.
NEET UG Optics in other years
More NEET UG Optics questions
Two thin lenses of focal lengths f₁ = +20 cm and f₂ = -10 cm are in contact. The power of the combination is:
2026easy
The refractive index of glass is 1.5. The speed of light in glass is:
2026easy
In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power $(p)$ and magnification $(m)$ for each lens will be, respectively
2025medium
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 :
2025medium
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):
2025medium
Other Physics topics for NEET UG
Keep practicing Optics
Work through every NEET UG Optics PYQ, year by year.