Page 128 - Physics - XII
P. 128
Observations
Table for focal length of the convex lens (f )
1
Distance of tip of the needle from Focal length of convex lens
S. a+ b
No. Upper surface of Upper surface of f == (cm)
1
the convex lens, a (cm) the plane mirror, b (cm) 2
1.
2.
3.
Mean focal length f = _____ cm
1
Table for focal length of combination of convex lens and plano-concave lens formed by water (F )
1
Distance of tip of the needle from Focal length of combination
S.
No. Upper surface of the Upper surface of the plane F = a′′+ b′′ (cm)
1
convex lens, a' (cm) mirror, b' (cm) 2
1.
2.
3.
Mean focal length F = _____ cm
1
Table for focal length of combination of convex lens and plano-concave lens formed by oil (F )
2
Distance of tip of the needle from Focal length of combination
S. Upper surface of the Upper surface of the plane a′′ + b′′
No. F = 1 1 (cm)
2
convex lens, ′′ a (cm) mirror, ′′ b (cm) 2
1
1
1.
2.
3.
Mean focal length F = _____ cm
2
Radius of curvature of surface of the convex lens
Pitch of the spherometer = _____ cm
Least count of the spherometer = _____ cm
AB = _____ cm
BC = _____ cm
CA = _____ cm
l = AB BC CA+ + = _____ cm
3
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