Sunrise Oval Shape – Rankers Physics

Refraction by Prism: Practice Problem & Solution

Assertion (A): The sun appears oval shape at sunrise. Reason (R): At the time of sunrise sun appears a little before the actual sunrise.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution Explained:

To solve this problem, we apply the core principles of Refraction by Prism. Understanding the underlying formula is key to arriving at the correct answer below:

Atmospheric refraction causes sunlight to bend as it passes through Earth's atmosphere. This phenomenon makes the sun appear to rise earlier and distorts its shape into an oval or flattened form at the horizon due to differential refraction. Both Assertion (A) and Reason (R) are true, and (R) provides a correct explanation for (A).

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Assertion (A): A solid glass sphere is placed in air. A light ray enters into the sphere from outside. The ray cannot undergo total internal reflection inside the sphere. Reason (R): The angle of incidence at \(\text{1}^ \ext{st}\) surface cannot be greater than the critical angle for air-glass system.  
2. Assertion (A): Consider a prism A of refracting angle \(5^0\), and another prism B of refracting angle \(10^0\), . Both prisms are made of crown glass. If white light is incident on each prism, angular dispersion caused by prism B will be more. Reason (R): Dispersive power depends on the nature material.  
3. Assertion (A): The focal length of spherical mirror does not depend on the wavelength of light. Reason (R): The number of wavelengths in the visible region of spectrum are infinite.  
4. Assertion (A): In case of a concave mirror if a point object is moving towards the mirror along its principal axis then its image will always move away from the mirror. Reason (R): In case of reflection (along the principal axis of mirror) object and image always travel in same directions.  
5. Assertion (A): If an air bubble is trapped in a glass slab will not produce any lens action. Reason (R): Behaviour of a shape like a lens is in dependent of surrounding medium.