a)concave lens
b)concave mirror
c)convex mirror
d)concave and convex mirror
2006-09-25 22:58:48 · 12 answers · asked by Shodan 2 in Science & Mathematics ➔ Physics
For lenses :
1/f = (n-1)(1/r1+1/r2)
For mirrors it is twice that.
Now r is postive for convex suface and negative for concave surface. Also n is the refractive index of glass generally is taken as 1.5
Subsitute for the above choses and you find b, c, d are correct,
2006-09-26 01:55:52 · answer #1 · answered by Karthik I 2 · 0⤊ 0⤋
d)concave and convex mirror.
(For a spherically curved mirror, the focal length is equal to half the radius of curvature of the mirror. The focal length is positive for a concave mirror, and negative for a convex mirror.)
2006-09-25 23:12:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
A ray of light passing parallel to the principal axis and close to the principal axis after incident at a point Q on the mirror is reflected according to the law of reflection ( i = r ) and passes through the focus F. If O is the center of curvature of the mirror, consider the triangle OQF. Angle oQf = r the angle of reflection. Angle qOf = i the angle of incidence (the line OQ passes through two parallel lines). And therefore the Angle qOf = i As i = r the triangle is a isosceles tri angle and hence QF = OF If P is the pole of the mirror, considering large radius of curvature we can take PF =QF and hence OF = PF or half the radius of curvature.
2016-03-27 10:15:17 · answer #3 · answered by Anonymous · 0⤊ 0⤋
concave mirror and convex lens.
2006-09-25 23:00:23 · answer #4 · answered by brat boy 1 · 0⤊ 0⤋
d)concave&convex mirror
2006-09-26 00:41:25 · answer #5 · answered by TANNU G 1 · 0⤊ 0⤋
concave mirror
2006-09-28 06:56:57 · answer #6 · answered by peter 1 · 0⤊ 0⤋
answer is all of above..
for lens there are Two focal point corresponding to both mirrrors respectively..
focal length is always half of radius of curvature in magnitude irrespective of lens or mirrors, thats how u define a focal point...
2006-09-26 02:07:45 · answer #7 · answered by vicky 1 · 0⤊ 0⤋
concave
2006-10-03 22:55:04 · answer #8 · answered by kichu 2 · 0⤊ 0⤋
Obviously all of them.
2006-09-26 02:14:18 · answer #9 · answered by dwarf 3 · 0⤊ 0⤋
the answer is d)
2006-10-03 12:21:00 · answer #10 · answered by quark_sa 2 · 0⤊ 0⤋