Power Sharing, Class 10 Civics NCERT Solutions

1. Angle of reflection is

the angle between the reflected ray and the incident ray.

the angle between the incident ray and the normal.

the angle between the reflected ray and the normal.

the angle between the reflected ray and the mirror surface.

Question 1 of 5

2. A doctor has prescribed a corrective lens of power +1.5 D to one of his patients. The focal length and the nature of the lens is

6.67 cm , converging

– 66.7 cm , diverging

66.7 cm , converging

– 6.67 cm , diverging

Question 2 of 5

3. Which one is correct as the new cartesian sign conventions?

Object distance is negative when taken from left of pole.

Image distance is positive when taken from left of pole.

All distances are measured from the principal focus

Image always forms above the principal axis.

Question 3 of 5

4. After refraction through a rectangular glass slab the emergent ray is

collinear to incident ray.

totally internally reflected.

parallel to incident ray.

perpendicular to incident ray.

Question 4 of 5

5. Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows:
Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen.
Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen.
Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen.
Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen.
Arrange these techniques in order of decreasing accuracy in measurement.

B,C,A,D

D,B,C,A

D,C,A,B

B,D,C,A

Question 5 of 5