Q1. An object is placed at a distance of 15 cm from a concave lens of focal length 10 cm. What is the nature of the image formed?A Virtual and inverted B Virtual and erect C Real and erect D Real and inverted View full solution →
Q2. Light enters from air into glass having refractive index 1.50. What is the speed of light in the glass? (Speed of light in vacuum is 3 x 10⁸ m/s).A 1.5 x 10⁸ m/s B 2.0 x 10⁸ m/s C 3.0 x 10⁸ m/s D 4.5 x 10⁸ m/s View full solution →
Q3. A doctor prescribes a corrective lens of power +2.0 D. Is this lens converging or diverging, and what is its focal length?A Converging, 50 cm B Converging, -50 cm C Diverging, -50 cm D Diverging, 50 cm View full solution →
Q4. Assertion (A): A magnifying glass uses a convex lens. Reason (R): A convex lens can form a virtual, magnified image.A A is true but R is false. B A is false but R is true. C Both A and R are true and R is the correct explanation of A. D Both A and R are true but R is not the correct explanation of A. View full solution →
Q5. Assertion (A): A spherical lens formula is given by 1/f = 1/v - 1/u. Reason (R): All distances for lenses are measured from the optical center.A Both A and R are true but R is not the correct explanation of A. B Both A and R are true and R is the correct explanation of A. C A is false but R is true. D A is true but R is false. View full solution →
Q6. A light ray travels from a medium X to a medium Y. The speed of light in X is 2.5 x 10⁸ m/s, and in Y it is 2.0 x 10⁸ m/s. What is the refractive index of medium Y with respect to medium X?A 5.0 B 2.5 C 1.25 D 0.8 View full solution →
Q7. What is the condition for a lens to have infinite focal length?A When its power is infinite. B When it is very thin. C When it is a plane glass slab. D When it is made of a very dense material. View full solution →
Q8. Assertion (A): The bottom of a tank filled with water appears raised. Reason (R): Light rays bend away from the normal when they travel from a denser medium to a rarer medium.A A is true but R is false. B Both A and R are true and R is the correct explanation of A. C Both A and R are true but R is not the correct explanation of A. D A is false but R is true. View full solution →
Q9. The refractive index of diamond is 2.42. What is the meaning of this statement in relation to the speed of light?A The speed of light in vacuum is 2.42 times the speed of light in diamond. B The speed of light in diamond is 1/2.42 times the speed of light in vacuum. C The speed of light in diamond is 2.42 times the speed of light in vacuum. D The speed of light in diamond is 2.42 m/s. View full solution →
Q10. Assertion (A): When an object is placed at 2F of a convex lens, its image is formed at 2F on the other side. Reason (R): The magnification of the image formed when the object is at 2F is -1.A Both A and R are true but R is not the correct explanation of A. B Both A and R are true and R is the correct explanation of A. C A is false but R is true. D A is true but R is false. View full solution →
Q11. What is the angle of deviation when a light ray passes through the center of curvature of a spherical mirror?A 90° B 0° C 180° D 45° View full solution →
Q12. A convex lens of focal length 10 cm forms a virtual image 15 cm from the lens. Where is the object placed?A -20 cm B -30 cm C -10 cm D -6 cm View full solution →
Q13. An object is placed at a distance of 10 cm from a plane mirror. If the object is moved 5 cm towards the mirror, how does the distance between the object and its image change?A Increases by 10 cm B Increases by 5 cm C Decreases by 5 cm D Decreases by 10 cm View full solution →
Q14. If the refractive index of water is 4/3, and that of glass is 3/2, what is the refractive index of glass with respect to water?A 9/8 B 2 C 1/2 D 8/9 View full solution →
Q15. An object is placed at the center of curvature of a concave mirror. If the radius of curvature is 20 cm, what is the position of the image?A -20 cm B At infinity C -10 cm D -40 cm View full solution →
Q16. A man is standing in a room and can see his full image in a plane mirror. If the man's height is H, what is the minimum height of the plane mirror required?A H/4 B H/2 C 2H D H View full solution →
Q17. A convex mirror is used as a security mirror in a shop. The owner observes a customer 5 m away, and her image appears to be 1/5th the actual size. Calculate the focal length of the mirror.A +2.0 m B +1.25 m C +1.0 m D +1.5 m View full solution →
Q18. What is the focal length of a plane mirror?A Negative B Zero C Infinity D Positive View full solution →
Q19. A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 25 cm. What is the nature of the combined lens system?A Plano-concave B Converging C Plano-convex D Diverging View full solution →
Q20. If an object is placed at 2F of a convex lens, and a screen is placed at 2F on the other side, what will be the magnification of the image?A -1 B -0.5 C +1 D +0.5 View full solution →