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qUESTIONS

If the surface area of any liquid surface is increased by 50%, then its surface tension will

A convex lens of refractive index 3/2 has a power of 2.5. If it is placed in a liquid of refractive index 2, the new power of the lens is: (D = diopter)

A ray of light from denser medium strikes a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90° with each other. The angle of reflection and refraction are r and r’. The critical angle is :

An optical fiber essentially consists of thin transparent flexible core of material of refractive index ‘μ1’ surrounded by flexible cover called cladding with refractive index ‘μ2’. Then

A convex lens forms an image of an object placed 20 cm away from it at a distance of 20 cm on the other side of the lens. If the object is moved 5 cm towards the lens, the image will move:

When a ray of monochromatic light is passed through an equilateral glass prism. It is found that the refracted ray in glass is parallel to the base of the prism. i and e denote the angles of incidence and emergence respectively, then:

If μ represents refractive index when a light ray goes from medium i to medium j, then the product, 2μ1 × 3μ2 × 4μ3 is equal to :

Refractive index of medium is n. The incidence angle is twice that of refracting angle. The angle of incidence is:

A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a ray from source to surface of slab is same as to travel through glass slab. The distance from the surface is

For a light ray to undergo total internal reffection, light must travel from (i = angle of incidence, ic = critical angle)

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