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
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
Statements:
Some chalks are wires.
No wire is pole.
Some poles are irons .
Conclusions:
I. No pole is a wire.
...Statements: Â Â some record are folder.
                             No folder is a data.
     ...
In the questions given below, there are three statements followed by three conclusions I, II and III. You have to take the three given statements to be...
Statements: Some trucks are buses.
All buses are cars.
All cars are bikes.
Conclusions: I. Some trucks are bikes.
II....
Statements:
100% King are Queen
Some Army are Queen
No Queen are Soldier
Conclusions:
I. Some Soldier are Army
II. At least Some King are Army
Statements:
Some guests are hosts
All hosts are invitations
No invitation is a decoration
Conclusion :
I. Some gu...
Statements:
All eggs are trays.
No tray is a white.
Some whites are ducks.
Conclusions:
I. Some ducks are not egg...
Statements:
Only a few Dogs are cats
Some cats are not tiger
No tiger are rat
Only a few rat are lion
Conclusions:...
In the question below are given some statements followed by some conclusions. You have to take the given statements to be true even if they seem to be ...
Relevant for Exams:
