Practice free Optics (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
An object is placed at a distance of f/2 , the from a convex lens the image will be
$ {1 \over v } - {1 \over u } = {1 \over f} Here , u = { -f \over 2 } $
Angle of prism is A and its one surface is silvered. Light rays falling at an angle at incidence 2Aon first surface return back through the same path after suffering reflection at second silvered surface .What is the refractive index of material ?
The minimum deviation produced by a glass prism of angle 60° is 30°. If the velocity of light in vaccum is $3 \times 10^8 m/s$. Then what is the velocity of light in glass in m/s ?
$ n = { sin \left( {A + \delta m \over 2 } \right) \over sin {A \over 2 } }$ $ velocity of light in glass = C_{air } \over n $
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}) $
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