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Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the speed of light in a vacuum?
💡 Hint: Think about how fast light travels in space.
Question 2
Easy
Name one type of lens.
💡 Hint: Consider how they manipulate light.
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 is the speed of light in a vacuum?
- 150,000 km/s
- 300,000 km/s
- 600,000 km/s
💡 Hint: This speed is a universal constant.
Question 2
True or False: Light can travel through a vacuum.
- True
- False
💡 Hint: Consider the light from the Sun reaching Earth.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A light ray hits a glass slab at an angle of 30 degrees. If the refractive index of glass is 1.5, what is the angle of refraction?
💡 Hint: Don’t forget to convert degrees into radians if necessary, but keep it in degrees for this question.
Question 2
An optical lens has a focal length of 20 cm. How far must an object be placed from this lens to form a sharp image on a screen situated 30 cm from the lens?
💡 Hint: Consider rearranging the lens formula to isolate the object distance.
Challenge and get performance evaluation