Advertisements
Advertisements
प्रश्न
What is mirage?
उत्तर
Mirage takes place in hot regions. The light from distant objects appears to be reflected from the ground. For mirage to form refractive index goes on increasing as we go up.
APPEARS IN
संबंधित प्रश्न
Light of wavelength 5000 Å propagating in air gets partly reflected from the surface of water. How will the wavelengths and frequencies of the reflected and refracted light be affected?
- Figure shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure?
- What is the answer if there is no outer covering of the pipe?
An object P is focussed by a microscope M. A glass slab of thickness 2.1 cm is introduced between P and M. If the refractive index of the slab is 1.5, by what distance should the microscope be shifted to focus the object again?
A converging beam of light traveling in air converges at a point P as shown in the figure. When a glass sphere of refractive index 1⋅5 is introduced in between the path of the beam, calculate the new position of, the image. Also, draw the ray diagram for the image formed.
Why do stars twinkle?
Write a short note on the prisms making use of total internal reflection.
A ray of light travels from air to water to glass and aga in from glass to air. Refractive index of water with respect to air is 'x' glass with respect to water is 'y' and air with respect to glass is 'z'. which one of the following is correct?
The critical angle for a ray of light from glass to air is 'θ' and refractive index of glass with respect to air is 'n'. If a ray of light is incident from air to glass at an angle 'θ', then corresponding angle of refraction is ______.
A ray of light passes through equilateral prism such that the angle of incidence is equal to angle of emergence and each of these angles is equal to `(3/4)^"th"` the angle of prism. The angle of deviation is ______.
The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure, the path shown is correct?
