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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is refraction?
💡 Hint: Think about what happens when you place a straw in water.
Question 2
Easy
Define focal length.
💡 Hint: What happens to light when it travels through a lens?
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What happens to light when it enters a denser medium?
- It bends towards the normal
- It bends away from the normal
💡 Hint: Think about how a straw looks when put into water.
Question 2
What is the lens maker's formula used for?
- Calculating the focal length
- Determining power of the lens
- Finding the radius of an image
💡 Hint: Consider what information is needed to design a lens.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A lens is designed so that the ratio of its focal length to its radius of curvature is 1:5. Calculate the focal length if the radius is 10 cm.
💡 Hint: Look at relationships given in lens maker's formula.
Question 2
Using a lens with R1=20 cm and R2=-20 cm, find the focal length for a lens of n=1.5. Show all calculations.
💡 Hint: Apply the lens maker's formula step by step to derive f.
Challenge and get performance evaluation