Question

1. the soap prepared in laboratories is crude soap. it is :
a)fit to use as toilet soap

b) corrosive

c) fit for washing but not for bathing

d)non- corrosive

2. in order to determine the focal length of a concave mirror by obtaining the image of distant object on screen ,the position of screen should be:

a) parallel to plane of concave mirror

b) perpendicular to plane of concave mirror

3. which of the following can be used to find the focal length of a convex lens?

a) light from the sun

b) light from a tree next to the window

4. if we reverse the emergent ray, it goes back along the same path. then,

(1) angle of deviation increases

(2) angle of deviation decreases

(3) angle of deviation remains the same

among which is correct?

a) 4

b) 2

c) 3

Answer 1

it is one
mark as brainliest pls

Answer 2

1. b
2. b
3. a
4. c

Hope u find this useful... ^_^