Two concave lenses L_1 and L_3 are kept in contact with each other. IF the space between the two lenses is filled with a material of smaller retractive index, the magnitude of the local length of the combinations

Two concave lenses L_1 and L_3 are kept in contact with each other. IF

1.	Two concave lenses L_1 and L_3 are kept in contact with each other. IF the space between the two lenses is filled with a material of smaller retractive index, the magnitude of the local length of the combinations
Answer» BECOMES undefined remains unchanged increases decreases Answer :C