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рдкреНрд░рд╢реНрди
Yesh find out F1 and F2 of symmetric convex lens experimentally then which conclusion is true.
рдкрд░реНрдпрд╛рдп
a) ЁЭР╣1 = ЁЭР╣2
b) ЁЭР╣1 > ЁЭР╣2
c) ЁЭР╣1 < ЁЭР╣2
d) ЁЭР╣1 ≠ ЁЭР╣2
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рдЙрддреНрддрд░
a) ЁЭР╣1 = ЁЭР╣2
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Draw a labelled ray diagram to show how a ray of light passes through a parallel-sided glass block if it hits the glass block at 90° (that is, perpendicular to the glass block).
If an object is placed at the focus of a convex lens, where is the image formed?
State any two uses of convex lenses.
Describe with the help of a ray-diagram, the formation of image of a finite object placed in front of convex lens between f and 2f. Give two characteristics of the image so formed.
How could you find the focal length of a convex lens rapidly but approximately?
Find the nature, position and magnification of the images formed by a convex lens of focal length 0.20 m if the object is placed at a distance of:
0.25 m
Which type of lenses are:
thicker in the middle than at the edges?
What kind of lens can form:
an inverted magnified image?
An object is placed 20 cm from (a) a converging lens, and (b) a diverging lens, of focal length 15 cm. Calculate the image position and magnification in each case.
What type of lens is used to correct
hypermetropia
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is:
The given below figure shows an object OA and its image IB formed by a lens
. 
draw suitable rays to locate the lens and its focus.
A convex lens forms an image of an object equal to the size of the object. Draw a diagram to illustrate it.
In the following cases, where must an object be placed in front of a convex lens so that the image formed is of the same size as the object?
A student places a 8.0 cm tall object perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. He obtains a sharp image of the object on a screen placed on the other side of the lens. What will be the nature (inverted, erect, magnified, diminished) of the image he obtains on a screen? Draw ray diagram to justify your answer.
If you are to determine to focal length of a convex lens, you should have
(A) a convex lens and a screen
(B) a convex lens and a lens holder
(C) a lens holder, a screen holder and a scale
(D) a convex lens, a screen, holder for them and a scale
State the nature and position of the object on the principal axis to obtain a real image of the same size
Draw a ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror.
_______ is a combination of two convex lenses with small focal length.
Distinguish between:
Concave lens and Convex lens
