Frequent Geometrical Optics Questions

A bird in air is diving vertically over a tank with speed 6 cm/s. Base of tank is silvered. A fish in the tank is rising upward along the same line with speed 4 cm/s. Water level is falling at rate of 2 cm/s. (Refractive inde ...

A bird in air is diving vertically over a tank with speed 6 cm/s. Base of tank is silvered. A fish in the tank is rising upward along the same line with speed 4 cm/s. Water level is falling at rate of 2 cm/s. (Refractive inde ...

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*Image* A solid iron sphere of radius=1m is just submerged in a water tank. A point source of light is kept vertically above its center at a distance 1m from the water surface. Find the area of the sphere's shadow. Refractive ...

A plane glass slab is kept over various colored letters, the letter which appears least raised is ...

A parallel sided block of glass of refractive index 1.5 which is 36 mm thick rests on the floor of a tank which is filled with water (refractive index = 4/3). The difference between apparent depth of floor at A & B when seen ...

A reflecting surface is represented by the equation Y=frac{2L}{pi }sin left( frac{pi x}{L} ight).~0le xle L . A ray travelling horizontally becomes vertical after reflection. The coordinates of the point (s) where this ray is ...

A thin lens of focal length f and its aperture diameter d, forms a real image of intensity I. Now the central part of the aperture upto diameter (d/2) is blocked by an opaque paper. The focal length and image intensity woul ...

When a lens of power P ( in air ) made of material of refractive index mu is immersed in liquid of refractive index {{mu }_{0}} . Then the power of lens is: ...

A fish rising vertically up towards the surface of water with speed 3 ms–1 observes a bird diving vertically down towards it with speed 9 ms–1. The actual velocity of bird is *Image* ...

A short linear object of length l lies along the axis of a concave mirror of focal length f at a distance u form the pole of the mirror. The size of the image is approximately equal to ...

A point object O is placed between two plan mirrors as shown is fig. The distance of the first three images formed by mirror from it are *Image* ...

Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30o at a point just inside one end of A. The plane of incidence coincides with the plane of the figu ...