Qstnid -A-29-a-if Half Part Of A Convex Lens Is Covered, The Focal Length ........ . . . . . . . . ... Change, But The Intensity Of Image ................... (B) A Convex Lens Is Placed In Water. Its Focal Length Will .............. (C) The Focal Length Of A Then Convex Lens Is .................. Than That Of A Thick Convex Lens. - 05: Refraction Through A Lens

with Solutions - page 3

#29-a
If half part of a convex lens is covered, the focal length ........ . . . . . . . . ... change, but the intensity of image ................... (b) A convex lens is placed in water. Its focal length will .............. (c) The focal length of a then convex lens is .................. than that of a thick convex lens.
Ans : If half part of a convex lens is covered, the focal length does not change, but the intensity of image decreases. (b) A convex lens is placed in water. Its focal length will increase. (c) The focal length of a thin convex lens is more than that of a thick convex lens.
Multiple Choice Type

#29-b
A convex lens is placed in water. Its focal length will ..............
Ans : A convex lens is placed in water. Its focal length will increase.

#29-c
The focal length of a then convex lens is .................. than that of a thick convex lens.
Ans : The focal length of a thin convex lens is more than that of a thick convex lens.
Multiple Choice Type