Two identical thin plano-convex glass lenses (refractive index 1.5) each having

⇦

⇨

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 contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is

Options

(a) (-20 cm)
(b) (-25 cm)
(c) (-50 cm)
(d) 50 cm

Correct Answer:

(-50 cm)

Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.

Related Questions:

1. A tuning fork gives 4 beats with 50 cm length of a sonometer
2. The ratio of radii of planets A and B is K₁ and ratio of accelerations
3. The magnetic flux linked with a coil at any instant t is given by ?, find emf
4. In which case positive work has to be done in seperating them?
5. A body of mass m slides down an incline and reaches the bottom

Topics: Ray Optics (94)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends