Rankers Physics

Lens Makers Formula/ Len's Formula: Practice Problem & Solution

A convex lens of focal length 50 cm forms a real image of size three times of size of object then position of object will be :
-100/3 cm
+100/3 cm
-200/3 cm
+200/3 cm

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1. Two convex lens of focal length 20 cm and 25 cm are placed in contact with each other, then power of this combination is 
2. Assertion (A): A real object is placed on the optic axis of a lens such that an erect image of twice the size of the object is obtained. The lens must then be a convergent lens. Reason (R): Erect image of a real object can be produced by a concave lens and also by a convex lens.  
3. Assertion (A): A healthy man wearing glasses of focal length \(+1\text{ m}\) cannot see beyond \(1\text{ m}\). Reason (R): A convex lens can form a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, the intensity of the image will decrease but the image will not be shifted upward or downward.  
4. Assertion (A): An object placed at a distance less than \(25 \text{ cm}\), in front of a normal eye. The image of this object on retina is blurred. Reason (R): Image is formed before retina.  
5. Assertion (A): A simple microscope may have different magnification for different persons. Reason (R): All persons must have the same near point distance of \(25\text{ cm}\).