Advertisements
Advertisements
प्रश्न
Is the formula "Real depth/Apparent depth = μ" valid if viewed from a position quite away from the normal?
उत्तर
No, because this formula is only valid when the angles of incidence and refraction are small. When the angles of incidence and refraction are large, we cannot use relations sini = tani and sinr = tanr to derive the formula for the apparent depth.
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?
A small pin fixed on a table top is viewed from above from a distance of 50 cm. By what distance would the pin appear to be raised if it is viewed from the same point through a 15 cm thick glass slab held parallel to the table? Refractive index of glass = 1.5. Does the answer depend on the location of the slab?
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.
Determine the value of the angle of incidence for a ray of light travelling from a medium of refractive index \[\mu_1 = \sqrt{2}\] into the medium of refractive index \[\mu_2 = 1\] so that it just grazes along the surface of separation.
A glass lens of refractive index 1.45 disappears when immersed in a liquid. What is the value of refractive index of the liquid?
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at
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
Figure shows a transparent hemisphere of radius 3.0 cm made of a material of refractive index 2.0. (a) A narrow beam of parallel rays is incident on the hemisphere as shown in the figure. Are the rays totally reflected at the plane surface? (b) Find the image formed by the refraction at the first surface. (c) Find the image formed by the reflection or by the refraction at the plane surface. (d) Trace qualitatively the final rays as they come out of the hemisphere.
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.
Choose the correct option.
There are different fish, monkeys, and water of the habitable planet of the star Proxima b. A fish swimming underwater feels that there is a monkey at 2.5 m on the top of a tree. The same monkey feels that the fish is 1.6 m below the water surface. Interestingly, height of the tree and the depth at which the fish is swimming are exactly same. Refractive index of that water must be
Answer the following question.
Define absolute refractive index and relative refractive index. Explain in brief with an illustration for each.
A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45°. The ray can undergo total internal reflection for the following n.
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?
Why do stars twinkle?
What is mirage?
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 ______.
The critical angle is maximum when light travels from ______.
`(a^mu"w"=4/3,a^mug=3/2)`
When a ray of light is incident normally on one refracting surface of an equilateral prism of refractive index 1.5, the emerging ray ______.
`[sin^-1(1/1.5)=41.8^circ]`
Light travels in two media A and B with speeds 1.8 × 108 ms−1 and 2.4 × 108 ms−1 respectively. Then the critical angle between them is:
