Question
An object is placed at a distance of 10 cm in front of a
double convex lens made of glass of refractive index 1.5. Both the radii of curvature of the lens are 30 cm in magnitude. What is the position of the image formed?Solution
Given, Distance of the object from the lens = u = -10 cm Refractive index of the lens = µ = 1.5 Radii of curvature of the lens are 30 cm in magnitude R1 = 30 cm and R2 = -30 cm (As per sign convention) According to Len's Maker's formula 1/f = (µ - 1)(1/R1 - 1/R2) = (1.5 - 1)(1/30 - (-1/30) = 0.5 x 2/30 = 1/30 or, f = 30 cm From lens equation, 1/v - 1/u = 1/f v = fu/(u + f) = (30 x -10)/(-10 + 30) = -300/20 = -15 cm The image is formed 15 cm on the same side as the object
Four of the following five letter cluster are alike in a certain manner and one is different. Find the letter cluster which is different.
Four numbers are given, out of which three are alike in a certain manner and one is different. Choose the different number.
Four words have been given, out of which three are alike in some manner and one is different. Select the odd word.
Four number-pairs are given, out of which three are alike in a certain manner and one is different. Choose the different number-pair.
Find the odd one out.
1) Brick 2) Heart 3) Club 4) Spade
Find the ODD one out from the given options.
In the following question, select the odd letters from the given alternatives.
Select the option in which the numbers are NOT related in the same way as the numbers of the following sets.
(42, 54, 36)
(75, 90, 45)
Three of the following four letter-clusters are alike in a certain way and one is different. Pick the odd one out.
Arrange the letters of each group to make a meaningful word and find the odd man out:
Relevant for Exams:
