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An equilateral prismdeviates a ray through $ 45 ^\circ $ for two angles of incidence differing by 200. What is the n of the prism?
$ \delta = i_1 + i_2 -A $ $ Now, n = { sin i_1 \over sin r_1 } = { sin i_2 \over sin (60 - r_1) } $
A ray of light is incident normally on one of the faces of a prism of apex $ 30 ^\circ $ and $ n = \sqrt 2 $ What is the angle of deviation of the ray ?
$ Here i = 0 and r_1 = 0 $ $ Now, A = r_1 + r_2 $ $ n = {sin e \over sin r_2 } $
A veseel of depth t is half filled with oil of refractive index $n_1$ and the other half is filled with water (refractive index $n_2$). The apparent depth of the vessel when viewed from above is
.The appartent depth is given by $ I' = { t_1 \over n_1 } + { t_2 \over n_2 } $
A bird in air looks at a fish vertically below it and inside water, $h_1$ is the height of the bird above the surface of water and $h_2$, the depth of the fish below the surface of water. If refractive index of water with respect to air be n, then what is the distance of the fish observed bythe bird ?
Appera ht position of fish as seen by bird is $ h_1 + { h_2 \over n } $
Monochromatic light of wave length traveling in a medium of reflactive index $n_1$ euters a denser medium of refractive index $n_2$. What is the wave length in the second medium ?
$ \lambda_1 = { c \over n_1 v} and \lambda_2 = { c \over n_2 v } $
Light travels through a glass plate of thickness t and having refractive index n. If C be the velocity of light in vacuum. What is the time taken by the light of travel this thickness of glass ?
n = velocity of light in vacaum /velocity of light in glass plate Time taken = distance / velocity = $ {t \over (c/n) } = {nt \over c } $
A beam of light is converging towards a point I on a screen. A plane parallel plate of glass whose thickness is in the direction of beam = t, refractive index = n is introduced in the path of the beam. The convergence point is shifted by ..........
When a glass plate of thickness t is introduced, then the optical path increases by t/ n . So, the convergence point shifts nears by $ { t - { t\over n } } = t ( 1 -{1 \over n}) $
The velocity of light in glass whose refractive index with respect to air is 1.5 is $2 \times 10^8 m/s$. Ina certain liquid, the velocity of light is found to be $2.5 \times10^8 m/s$. What is the refractive index of the liquid with respect to air?
$ n_g = { C \over v_g } and, n_l = {C \over v_1 } $ $n_l = ng { v_g \over v_l } $
When P-N junction diode is forward biased, then......
When a P-N junction diode is forward biased, the external voltage reduces the potential barrier, thereby reducing the depletion region width and the barrier height. This allows for an easier flow of charge carriers across the junction.
A P-N junction is said to be forward based when
A P-N junction is forward biased when a potential difference is applied across it such that the P region is connected to the positive terminal of the power supply and the N region is connected to the negative terminal. This reduces the barrier and allows current to flow easily.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.