Physics
State the condition for each of the following :
(a) a lens has both its focal lengths equal.
(b) a ray passes undeviated through the lens.
Refraction Lens
92 Likes
Answer
(a) When the medium is the same on either side of the lens then it has both its focal lengths equal.
(b) A ray passes undeviated through the lens, when it is incident at the optical centre of the lens.
Answered By
61 Likes
Related Questions
Define the term focal length of a lens.
What do you mean by focal plane of a lens?
Complete the following sentences —
(a) If half part of a convex lens is covered, the focal length …………… change, but the intensity of image …………….
(b) The focal length of a thin convex lens is …………… than that of a thick convex lens.
(c) A tumbler filled with water behaves as a …………… lens.
Name the two kinds of lens? Draw diagrams to illustrate them.