A concave lens and convex lens have same focal length of 16 cm each. They both are kept in contact. This combination is used to view an object 3.5 cm long, the image of this object is
Open in App
Verified by Toppr
The focal..length of convex lens is positive and concave lens negative, hence, combination 1f=1f1+1f2 Given, f1=f2 1f=1f1−1f2=0 f=∞ The combination has infinite focal length. Hence, image of object is of same size.
Was this answer helpful?
A convex lens of focal length 25cm and a concave lens of focal length 10cm are placed in close contact with each other. Calculate the lens power of this combination
An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters is
A convex lens of focal length 10cm in contact with a concave lens of focal length 20cm. This combination is used to focus an object positioned 30cm infront of combination. The image will be formed at a distance of
A convex lens (of focal length 20cm) and a concave mirror, having their principal axes along the same lines, are kept 80cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of 30cm to the left of the convex lens, its image remains at the same position even if the concave mirror is removed. The maximum distance of the object for which this concave mirror, would produce a virtual image by itself, would be:
A concave and convex lens have the same focal length of 20 cm and are put in contact to form a lens combination. The combination is used to view the object of 5 cm length kept at 20 cm from the combined lens. Then