Ray Optics Test...

A bi-convex lens is formed with two thin piano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surfaces are of the same radius of curvature R = 14 cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be

An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be insharp focus on film

Which source is associated with a line emission spectrum

Formula for dispersive power is (where symbols havetheir usual meanings)
or
If the refractive indices of crown glass for red, yellow and violet colours are respectively µ_r, µ_y and µ_v; then the dispersive power of this glass would be

The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then

We use flint glass prism to disperse polychromatic light because light of different colours

A prism (μ = 1.5) has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36\' = 0.75)

Solar spectrum is an example for

A spectrum is formed by a prism of dispersive power \'ω\'. If the angle of deviation is ‘δ’, then the angular dispersion is

Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is (cos 41° = 0.75)