Carbon disulfide (n = 1.63) is poured into a container made of crown glass (n = 1.52). What is the critical angle for internal reflection of a ray in the liquid when it is incident on the liquid-to-glass surface?
Critical angle is
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Light is confined within the core of a simple optical fiber by:
Mirage is caused due to
Total internal reflecting mirrors are preferred over plane mirrors because
The radii of curvature of the surfaces of a double convex lens are 20cm and 40cm respectively, and its focal length is 20cm. What is the refractive index of the material of the lens?
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
A square card of side length 1mm is being seen through a magnifying lens of focal length 10cm. The card is placed at a distance of 9cm from the lens. The apparent area of the card through the lens is
A real image of a distance object is formed by a plano-convex lens on its principal axis. Spherical aberration is
The image of the needle placed 45 cm from a lens is formed on a screen placed 90 cm on the other side of the lens. The displacement of the image, if the needle is moved by 5.0 cm away from the lens is
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