Answer :

Given

f1 = 25cm (Focal length of convex lens is positive)


f1 = 0.25m (1m = 100cm)


P (in dioptre) =


Power of convex lens,(F=25 cm) P1 =


P1 =
P1 = 4D


f2 = -10cm (Focal length of concave lens is negative)


f2 = -0.1m (1m = 100cm)


Power of the concave lens(F=10 cm), P2 =


P2 =


P2 = -10D.


Power of combination = P1 + P2.


P = 4D – 10D = -6D.


Lens power of the combination is -6D. Since it is negative therefore the new lens will behave like concave lens having a focal length of 16.6cm.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Reflection of light-2Reflection of light-2Reflection of light-238 mins
Refraction of Light-2Refraction of Light-2Refraction of Light-241 mins
Reflection of Light-1Reflection of Light-1Reflection of Light-144 mins
Refraction of light-1Refraction of light-1Refraction of light-125 mins
History - Concept and QuestionsHistory - Concept and QuestionsHistory - Concept and Questions57 mins
Revision on Substitution and  Elimination MethodRevision on Substitution and  Elimination MethodRevision on Substitution and Elimination Method44 mins
Trigo Marathon Part 1Trigo Marathon Part 1Trigo Marathon Part 146 mins
Trigo Marathon Part 2Trigo Marathon Part 2Trigo Marathon Part 245 mins
Application of Trigo Important QuestionsApplication of Trigo Important QuestionsApplication of Trigo Important Questions44 mins
Arithmetic Progression and 'nth' Term of APArithmetic Progression and 'nth' Term of APArithmetic Progression and 'nth' Term of AP55 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

A convex lens of All In One Science

State and define All In One Science

Two lenses have pAll In One Science

When two or more All In One Science

State the laws ofScience - Board Papers

The image of an oXam idea - Science

A concave lens haXam idea - Science

The optical prescLakhmir Singh & Manjit Kaur - Physics

What is the powerScience Lab Manual