Physics · 2015
NEET 2015 · 3 May · Code E · Q36
Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in…
Two identical thin plano-convex glass lenses (refractive index $\displaystyle 1.5$) each having radius of curvature of $\displaystyle 20$ cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is :
Official answer
(3)
-$\displaystyle 50$ cm
More from Ray Optics and Optical Instruments
- Which of the following is not due to total internal reflection?2011
- In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?2023
- Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is:2020
- The speed of light in media M_1 and M_2 is 1.5 × 10^8 m / s and 2.0 × 10^8 m / s respectively. A ray of light enters from medium M_1 to M_2 at an…2010
- Two transparent media A and B are separated by a plane boundary. The speed of light in those media are 1.5 × 10^8 m / s and 2.0 × 10^8 m / s,…2022
- A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of…2017
- A thin prism of angle 15° made of glass of refractive index μ_1=1.5 is combined with another prism of glass of refractive index μ_2=1.75. The…2011
- Two identical glass (μ_g=3 / 2) equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water (…2016
NEET (UG) 2015 Physics question, with the answer from NTA’s final answer key. Where our answers come from.