Exams › JEE Main › Physics

Given below are two statements : Statement-I : A plane wave after passing through prism remains as plane wave but passing through small pin hole may become spherical wave. Statement-II : The curvature of a spherical wave emerging from a slit will increase for increasing slit width. In the light of the above statements, choose the correct answer from the options given below. (1) Both Statement-I and Statement-II are false. (2) Both Statement-I and Statement-II are true. (3) Statement-I is true but Statement-II is false. (4) Statement-I is false but Statement-II is true.

1. Both Statement-I and Statement-II are false.
2. Both Statement-I and Statement-II are true.
3. Statement-I is true but Statement-II is false.
4. Statement-I is false but Statement-II is true.

Correct answer: Statement-I is true but Statement-II is false.

Solution

Statement-I is correct because a plane wave retains its planar nature after passing through a prism, while a small pinhole can cause the wavefront to diverge into a spherical wave. However, Statement-II is incorrect because increasing the slit width actually decreases the curvature of the spherical wave, leading to a flatter wavefront.

Related JEE Main Physics questions

• The pupil opening of a human eye is about 2 mm. If the average wavelength of visible light is taken as 5000 Å, the eye’s approximate angular resolving limit is
• For a single-slit diffraction pattern, the condition corresponding to the appearance of secondary maxima is
• In a Fresnel biprism setup, the two lens positions give slit separations of 16 cm and 9 cm. What is the true separation between the slits?
• In a Young’s double-slit setup, two monochromatic sources emit light of wavelengths 2500 Å and 3500 Å. Which pair of fringe orders from the two patterns will fall at the same position?
• In a Young’s double-slit setup, the intensity at a bright fringe maximum is \(I_0\). The slit separation is \(d = 5\lambda\), where \(\lambda\) is the wavelength of the light used. If the screen is placed at a distance \(D = 10d\), what intensity is observed at the point directly opposite one of the slits?
• What is the relationship between the polarizing angle and the critical angle?

⚔️ Practice JEE Main Physics free + battle 1v1 →