LIGHT: REFLECTION AND REFRACTION– 1 Mark Questions

Q1.  Is it possible that the laws of reflection change, if we use spherical mirror instead of a plane mirror? State your reasons.

Q2.  Out of convex mirror and concave mirror, whose focus is situated behind the mirror?

Q3.  Give the relationship of magnification with focal length of a spherical mirror.

Q4.  Between which two points of a concave mirror should an object be placed to obtain a magnification of -3?

Q5.  What is the velocity of light in a glass slab of refractive index 1.5?

Q6.   Is it possible that a convergent lens in one medium becomes divergent, when placed in another medium?

Q7.  If the magnification of a body of size 1 m is 2. What is the size of the image?

Q8.   When is the magnitude of the power of a lens equal to its focal length?

Q9. Define the term principal axis of a spherical mirror.

Q10. Define the principal focus of a concave mirror.

Q11. What is the magnification of the images formed by plane mirror and why?

Q12. We prefer a convex as a rear-view mirror in vehicles. Why?

Q13. Explain why a ray of light passing through the centre of curvature of a concave mirror, gets reflected along the same path.

Q14. What are the values of angle of incidence i and angle of reflection r for a normal incidence?

Q15. What is the unit of refractive index?

Q16. State a condition for no refraction of light entering from one medium to another.

Q17. Why is refractive index of atmosphere different at different altitudes?

Q18. How does the size of the image change as the object is brought closer from infinity towards the convex lens?

Q19.The refractive index of diamond is 2.42. What is the meaning of this statement?

Q20.  A ray of light incident on a concave mirror after passing through the centre of curvature is reflected back along the same path. What is the angle of incidence?

Q21.  What is the radius of curvature of a plane mirror?

Q22.   What is the power of sunglasses?

Q23.   Does refractive index change with colour of light?

Q24.  Redraw the ray diagram given below in your answer book and complete the path of ray.

Light_R and R _01

Direction In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as

(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

(c) If Assertion is true, but Reason is false.

(d) If Assertion is false, but Reason is true.

(e) If Assertion and Reason both are false.

Q25. Assertion: Convex mirror is preferred for rearview mirror in vehicles.

            Reason: The field view of a convex mirror is lesser than that of concave mirror.

Q26. Assertion: An object appears to be black.

            Reason: All the light falling on the object is absorbed and only black light is reflected from it.

Q27. Assertion: Lateral displacement is the distance between incident ray and the emergent ray.

            Reason: The wider the glass slab, the larger the lateral displacement.

Q28. Assertion: In the dispersion of white light by a prism, the red light bends the least.

            Reason: The frequency of red light is the highest.

Q29. Assertion: The object distance is the distance of the object from the lens.

            Reason: It is measured from the object to the optical centre of the Lens.

Q30.  The refractive index of a denser medium with respect to rarer medium is 5/4 then the refractive index of rarer medium with respect to denser medium will be

(a)5/4    

(b) √5/2

(c) 2/√5

(d)4/5

Q31.  When an object is placed on the principal axis of a convex lens between first focus and optical centre, then position of image will be

(a) on same side of the lens as the object between first focus and optical centre

(b) on same side of the lens as the object and away from the first focus

(c) on opposite side of the lens as the object between second focus and optical centre

(d) on opposite side of the lens as the object and away from the second focus

Q32.  Which of the following mirrors are used to get powerful parallel beams of light in headlights?

 (a) Plane mirrors              

(b) Convex mirrors

(c) Concave mirrors          

(d) Both (a) and (c)

Q33.  An object is placed at a distance of 10 cm in front of a concave mirror. It forms a real image three times larger than the object. The distance of image from the mirror is

(a) -30 cm            

(b) 30 cm             

(c) 10 cm             

(d) -10 cm

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