Advertisements
Advertisements
प्रश्न
A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter to the diver than what he actually is?
उत्तर
The diver is in the water and the fisherman is on land (i.e., in the air). Water is a denser medium than air. It is given that the diver is viewing the fisherman. This indicates that the light rays are travelling from a denser medium to a rarer medium. Hence, the refracted rays will move away from the normal. As a result, the fisherman will appear to be taller.
APPEARS IN
संबंधित प्रश्न
Monochromatic light of wavelength 589 nm is incident from air on a water surface. If µ for water is 1.33, find the wavelength, frequency and speed of the refracted light.
Is the formula "Real depth/Apparent depth = μ" valid if viewed from a position quite away from the normal?
Why does a diamond shine more than a glass piece cut to the same shape?
A narrow beam of white light goes through a slab having parallel faces.
(a) The light never splits in different colours
(b) The emergent beam is white
(c) The light inside the slab is split into different colours
(d) The light inside the slab is white
A converging beam of light travelling 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.
A point ‘O’ marked on the surface of a glass sphere of diameter 20 cm is viewed through glass from the position directly opposite to the point O. If the refractive index of the glass is 1.5, find the position of the image formed. Also, draw the ray diagram for the formation of the image.
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.
What is optical path? Obtain the equation for optical path of a medium of thickness d and refractive index n.
What is angle of deviation due to refraction?
Obtain the equation for critical angle.
Explain the reason for glittering of diamond.
Derive the equation for acceptance angle and numerical aperture, of optical fiber.
Obtain the equation for lateral displacement of light passing through a glass slab.
When a light ray is incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of material of prism is `sqrt2`, then angle of prism will be ______.
`sin pi/4=1/sqrt2, sin30^circ=cos60^circ=1/2`
Light travels from an optically denser medium 'A' into the optically rarer medium 'B' with speeds 1.8 × 108 m/s and 2.7 × 108 m/s respectively. Then critical angle between them is ______.
(µ1 and µ2 are the refractive indices of media A and B respectively.)
For a rectangular slab, refraction takes place at ______.
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?
A circular disc of radius ‘R’ is placed co-axially and horizontally inside an opaque hemispherical bowl of radius ‘a’ (Figure). The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index µ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc placed?
Show that for a material with refractive index `µ ≥ sqrt(2)`, light incident at any angle shall be guided along a length perpendicular to the incident face.
