We combined a convex lens of focal length and $f_{1}$ concave lens of focal length $f_{2}$ and their combined focal length was F. The combination of these lenses will be have like a concave lens, if :

f_{1} \leq f_{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

f_{1} = f_{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

f_{1} < f_{2}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

f_{1} > f_{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D $f_{1} < f_{2}$
If one of the lens is convex and the other is concave, then it behaves like concave lens, if $f_{1} < f_{2} .$ and it behaves like a convex lens, if $f_{1} > f_{2} .$

Suggest Corrections

Similar questions

A convex lens of focal length $f_{1}$ is kept in contact with a concave lens of focal length $f_{2}$ . Find the focal length of the combination.

f_{1}

f_{2}

If two thin lenses of focal length f₁ and f₂ are held in contact then the focal length of the combination will be

f_{1}

f_{2}

f_{1}

f_{2}

\frac{1}{f} = \frac{1}{f_{1}} + \frac{1}{f_{2}}

Join BYJU'S Learning Program