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Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.21 NCERT Solutions for Class 12 Physics Chapter 10 Question-21 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Answer the following questions: (a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation. (b) As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.20 NCERT Solutions for Class 12 Physics Chapter 10 Question-20 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.19 NCERT Solutions for Class 12 Physics Chapter 10 Question-19 Additional Exercise

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(a) The refractive index of glass is 1.5. What is the speed of light in glass? Speed of light in vacuum is 3.0 x 10⁸ m s⁻¹) (b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?

What is the shape of the wavefront in each of the following cases: (a) Light diverging from a point source. (b) Light emerging out of a convex lens when a point source is placed at its focus. (c) The portion of the wavefront of light from a distant star intercepted by the Earth.

In deriving the single slit diffraction pattern, it was stated that the intensity is zero at angles of nλ/a. Justify this by suitably dividing the slit to bring out the cancellation.

A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.

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