Chapter 16 – Optics

An observer looks at a distant tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appears : An observer looks at a distant tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appears : November 18, 2020 Category: Chapter [...]

The angular width of the central maximum in a single slit diffraction pattern is 60∘. The width of the slit is 1 μm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes can be observed on a screen placed at a distance 50 cm [...]

Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be I/2. Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be I/8. The angle between polarizer [...]

In a double-slit experiment, green light (5303A˚) falls on a double slit having a separation of 19.44μm and a width of 4.05 μ-m. The number of bright fringes between the first and the second diffraction minima is :- green light (5303A˚) falls on a double slit having a separation of 19.44μm and a width of [...]

Consider a Young’s double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength λ such that the first minima occurs directly in front of the slit (S1) ? Consider a Young's double slit experiment as shown in figure. What should be the slit separation d in terms [...]

In a double slit experiment, when a thin film of thickness t having refractive index μ is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is (λ is the wavelength of the light used) : In a [...]

Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio: the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio: Two [...]

The value of numerical aperture of the objective lens of a microscope is 1.25. If light of wavelength 5000 Å is used the minimum separation between two points to be seen as distinct will be The value of numerical aperture of the objective lens of a microscope is 1.25. If light of wavelength 5000 Å [...]

In a Young’s double slit experiment, the ratio of the slit’s width is 4:1. The ratio of the intensity of maxima to minima, close to the central fringe on the screen, will be close to the central fringe on the screen In a Young's double slit experiment the ratio of the slit's width is 4:1. [...]

Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600nm. coming from a distant object, the limit of resolution of the telescope is close to Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600nm. coming from a distant object the limit of [...]