CUET Preparation Today
Two lenses of power 3D and -1D are kept in contact. The focal length of the combined lens would be: |
50 cm 200 cm 100 cm 400 cm |
50 cm |
The correct answer is Option (1) → 50 cm Power of the combined lens (P) is, $P=P_1+P_2$ $=3D+(-1D)=2D$ and, focal length (f) is, $f=\frac{1}{P(m)}=\frac{100}{2}=50cm$ |
