74 The focal length of convex lens for red and blue light

is the actual inclination of the rod Ans 376 11 A convex mirror of radius of curvature 0 48 m is placed with its axis vertical at the bottom of a beaker Water is then poured into the beaker upto a height of 0 12 m A pin is fixed on the axis of the mirror 0 09 m above the surface of water Find i the position with respect to the pole of the mirror of the image of the pin formed by reflection in the mirror and ii the apparent position of this image with respect to the water surface as seen from above Given the R I of water 4 3 Ans i 0 12 m below the pole of the mirror ii 0 18 m below the water surface

58 Two optical media of refractive indices and contain x and y number of waves in the same thickness Their relative refractive index equal to 1 xy 3 X y 2 4 y X y x X M2 is

49 Which of the following produces a virtual image 1 lens camera 2 cinema projector 3 simple microscope 4 slide projector

13 In the figure shown the image of a real object O is formed at point I AB is the principal axis of the mirror the mirror must be A concave placed towards right of I C convex placed towards right of I B concave placed towards left of I D convex placed towards left of I m A

A star which is emitting radiation at a wavelength of 5000 is approaching the earth with a velocity of 1 5 x 10 m s The change in wavelength of the radiation as received on the earth is

In the shown figure M and M2 are two concave mirrors of the same focal length 10 cm AB and CD are their principal axes respectively A point object O is kept on the line AB at a distance 15 cm from M The distance between the mirrors is 20 cm Considering two successive reflections first on M and then on M2 The distance of final image from the line AB is S A 3 cm 5 A B 1 5 cm M 15cm C 13cm M C 4 5 cm D D 1 cm Iholawar Road Kota Raj 324005

Two plano concave lenses of glass 3 2 have radii of curvature of 20 cm and 30 cm respectively they are placed in contact with curved faces towards each other and space between them is filled with water of refractive index 4 3 Find the magnitude of focal length in cm of the combination

If f number of a camera changes from f 5 6 1 40 f 4 t then change in area of aperture is 2 50 bo 3 14 4 56

Object 50m 90cm f 1m f 8cm Find linear magnification in the given diagram 2 0 01 m 4 0 03 0 04 3 0 02

2 In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens The eye piece forms a real image of this line The length of this image is I The magnification of the telescope is 1 2 1 3 1 4 L I L I