A rectangular glass block of thickness 10 cm and refractive index 1.5 is placed over a small coin.A beaker is filled with water of refractive index `4//3` to a height of 10 cm and is placed over a small block.
Find the apparent position of jthe object,when it is viewed at normal incidence.
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A rectangular glass block of thickness 10 cm and refractive index 1.5 is placed over a small coin.A beaker is filled with water of refractive index 4//3 to a height of 10 cm and is placed over a small block. If the eye is slowly moved away from the normal at a certain position,the coin is found to diappear due to total internal reflection.At what surface does it happen and why? .

A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Fig. EP 9.12). When observed from the face AD, the pin shall

A convex lens of refractive index 1.5 has a focal length of 18 cm in air.Calculate the change in focal length,when it is immersed in water of refractive index 4//3 .

An object is placed 21 cm in front of a concave mirror of radius of curvature 10 cm.A glass slab of thickness 3 cm and refractive index 1.5 is then placed close to the irror in the space between the object and mirror as shown in Fig.2.62.Find the position of the final image formed.You may take the distacne of the near surface of the slab from the mirror to be 1 cm. .

A microscope is focussed ona mark on a piece of paper then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark.How should the microscope be moved to get the mark in focus again?

A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5.The distance of the virtual image from the surface of the sphere is

A 5.0 cm long needle is placed vertically at a distance 20 cm in front of a double convex lens made of a material of refractive index 1.5 having radii of curvature as 20 cm and 30 cm .Find the height of image formed.