Science

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Q1 :-A ray of light that strikes a plane mirror PQ at an angle of incidence of 30⁰, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

Q2 :-An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:

Q3 :-. A concave mirror produces a magnification of +4. The object is placed:

Q4:-A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:

Q5 :-An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is:

Q6:-Twinkling of stars is due to :-

Q7 :-The unit of power of lens is

Q8 :-Focal length of plane mirror is

Q9 :-Image formed by plane mirror is

Q10 :-In optics an object which has higher refractive index is called

Q11 :- Which of the following can make a parallel beam of light when light from a point source is incident on it?

Q12 :-Magnification produced by a rear view mirror fitted in vehicles

Q13 :-Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

Q14 :-A full length image of a distant tall building can definitely be seen by using

Q15 :-The laws of reflection hold good for

Q16 :-Light travel fastest in

Q17 :-Spherical mirror with reflecting surface curved inwards is called

Q18 :-The mirror used as rear-view mirror in vehicles

Q19 :-Convex lens is also known as

Q20 :-You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?