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Ray Optics And Optical Instruments QUESTIONS AND ANSWERS

IIT JEE : Ray Optics And Optical Instruments QUESTIONS AND ANSWERS :: part2 : 1 to 5

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

1.A plane mirror is placed along the y-axis as such x-axis is normal to the plane of the mirror. The reflecting surface of the mirror is towards negative x-axis. The reflecting surface of the mirror is towards negative x-axis. The mirror moves in positive x-direction with uniform speed of 5 m/s and a point object P is moving with constant speed of 5 m/s and a point object P is moving with constant speed 3 m/s in negative x-direction. The speed of image with respect to mirror is:

8 m/s

16 m/s

5 m/s

10 m/s

2.An object placed 10 cm infront of a lens has an image 20 cm behind the lens. What is the power of the lens (in diopter)?

1.5

3.0

-5.0

+15.0

3.In which of the following the length of the tube is equal to the sum of the focal lengths of the field and eye lenses?

Astronomical telescope

Galilean telescope

Terrestrial telescope

Microscope

4.The distance between the objective lens and the eye lens of an astronomical telescope when adjusted for parallel light is 100 cm. The measured value of the magnification is 19. The focal lengths of the lenses are:

85 cm and 15 cm

82 cm and 18 cm

95 cm and 5 cm

50 cm and 50 cm

5.A concave mirror and a convex lens both have same focal length in air. When they are submerged in glycerine, the focal length:

of both still remains unchanged

of the mirror remains unchanged while that of the lens increases

of the mirror remains unchanged while that of the lens decreases

of both may increase or decrease

More Ray Optics And Optical Instruments QUESTIONS AND ANSWERS available in next pages