OPTICES TEST by Rahul Tripathi

A narrow beam of white light goes through a slab
having parallel faces

(a) the light never splits in different colours

(b) the emergent beam is white

(d) the light inside the slab is white

Other

Please Specify :

The turning back of light into the same medium after incident on a boundary separating two media is called

(a) reflection of light

(b) refraction of light

(d) interference of light

In image formation from spherical mirrors, only paraxial rays are considered because they

(a) are easy to handle geometrically

(b) contain most of the intensity of the incident light

(d) show minimum dispersion effect

Astigmatism is corrected using

(a) cylindrical lens

(b) plano-convex lens

(d) convex lens

The focal length of a normal eye-lens is about

(a) 1 mm

(b) 2 cm

(d) 1 m

A beam of monochromatic blue light of wavelength 420 nm in air travels in water (μ = 4/3). Its wavelength in water will be

(a) 280 nm

(b) 560 nm

(d)400 nm

The focal length of the objective of a telescope is 60 cm. To obtain a magnification of 20, the focal length of the eye piece should be

(a) 2 cm

(b) 3 cm

(d) 5 cm

To explain the diffraction phenomenon a plane wave front is divided into

(a) groups

(b) sub groups

(d) quarter period zones

The diffraction phenomenon happens

(a) only for mechanical waves

(b) only for electromagnetic waves

(d) for both mechanical and electromagnetic waves

The principal focal length of a zone plate is more for

(a) Red colour

(b) Green colour

(d) Yellow colour

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