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{:("1 . Ratio of height of image to heig...

`{:("1 . Ratio of height of image to height of object","(a) Concave mirror"),("2. Used in hairpin bends in mountains", "(b) Total internal reflection"),("3. Coin inside water appearing slightly raised","(c) Magnification"),("4. Mirage","(d) Convex mirror"),("5. Used as Dentist's mirror","(e) Refraction"):}`

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1. (c) 2. (d) 3.(e) 4. (b) 5. (a)
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An object of length 2.5 cm is placed at the principal axis of a concave mirror at a distance 1.5 f. The image height is

A small object is placed at the centre of the bottom of a cylindrical vessel of radius 3 cm and height 4 cm filled completely with water. Consider the ray leaving the vessel through a corner. Suppose this ray and the ray along the axis of the vessel are used to trace the image. Find the apparent depth of the image and the ratio of real depth to the apparent depth under the assumptions taken. Refractive index -of water = 1-33.

A triangle ABC has vertices A(5, 1), B (-1, -7) and C(1, 4) respectively. L be the line mirror passing through C and parallel to AB and a light ray eliminating from point A goes along the direction of internal bisector of the angle A, which meets the mirror and BC at E, D respectively. If sum of the areas of triangle ACE and triangle ABE is K sq units then (2K)/5-6 is

A concave mirror of radius 40 cm lies on a horizontal table and water is filled in it upto a height of 5.00 cm. A small dust particle floats on the water surface at a point P vertically above the point of contact of the mirror with the table. Locate the image of the dust particle as seen from a point directly above it. the refractive index of water is 1.33.

A cylindrical gas container is closed at the top and open at the bottom. If the iron plate of the top is 5/4 times as thick as the plate forming the cylindrical sides, the ratio of the radius to the height of the cylinder using minimum material for the same capacity is (A) 3:4 (b) 5:6 (c) 4:5 (d) none of these

A five-digit number divisible by 3 is to be formed using the digits 0, 1, 2, 3, 4, and 5, without repetition. The total number of ways this can done is (a) 216 (b) 240 (c) 600 (d) 3125

A ray of light comes light comes along the line L = 0 and strikes the plane mirror kept along the plane P = 0 at B. A(2, 1, 6) is a point on the line L = 0 whose image about P = 0 is A' . It is given that L = 0 is (x-2)/(3)= (y-1)/(4)= (z-6)/(5) and P =0 is x+y-2z=3 . If L_(1) =0 is the reflected ray, then its equation is

Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2m. If the jogger is running at a speed of 5 ms^(-1) , how fast the image of the jogger appears to move when the jogger is (a) 39 m (b) 29 m (c) 19m (d) 9 m aways.