When a ray of light passes from rarer to denser medium, is suffers a phase change of
Correct answer: B. 180°
- A. 90°
- B. 180°
- C. 60°
- D. 45°
Explanation
When a ray of light travels from a rarer medium (such as air) to a denser medium (such as glass), and it reflects off the surface of the denser medium, it experiences a phase change of 180°. This is because the denser medium acts as a fixed end, causing the wave to invert upon reflection. The other options, 90°, 60°, and 45°, do not correspond to standard phase changes associated with the reflection from a boundary between media of differing refractive indices.
Last updated
About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
Practise Optics
665 free Optics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 7 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
8If the two sound waves produce beats, it is necessary that the two have:
A 16 cm long image of an object is formed by a convex lens on a screen placed normal to its principal axis. On moving the lens towards the screen, without changing the positions of the object and the screen, a 9 cm long image is formed again on the screen. The size of the object is:
A 4 cm high object is located 10 cm from the converging lens, whose focal length is 20 cm. The image so formed will be
A beam of electrons can
A beam of electrons can: