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What is the value of θ in the following diagram?

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Important Questions on Light - Reflection and Refraction

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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 13
Which of the following is used to make a periscope?
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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 14

If an object is placed between focus and optical centre of convex lens, image formed is__

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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 15
If focal length of a convex lens is 100 cm, what is the power of the lens?
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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 16
If magnification is negative, then image is _____.
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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 17

Which of the following lenses would you prefer to use while reading small letters found in a dictionary__

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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 18

Which mirror has a larger field of view?

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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 19

What is meant by the number of lens?

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SCIENCE [PHYSICS] Class-10>Chapter 4 - Light - Reflection and Refraction>Other Additional Questions>Q 20

Position of the object when convex lens forms a virtual and erect image is