Chapter 15- Light Class 7 science- Very Short Question and Answers – Solved Worksheet
Question- How does light travel, as demonstrated by the pipe experiment?
Answer- Light travels in a straight line.
Question- What happens to light when it passes through a translucent object?
Answer- It partially passes through, allowing objects behind it to be partially visible.
Question- What is the nature of the image formed by a plane mirror?
Answer- The image is virtual and upright.
Question- How does light behave when it hits a shiny surface?
Answer- It gets reflected back.
Question- What is the outcome when light encounters an opaque object?
Answer- No light passes through; it’s either absorbed or reflected.
Question- What type of image is formed by converging light rays?
Answer- A real image.
Question- What property of light allows transparent materials to be used in optics?
Answer- Its ability to be transmitted through such materials.
Question- Why does a bent pipe prevent seeing the candle flame?
Answer- Because it disrupts the straight path of light.
Question- What dictates the clarity of an image formed on a reflective surface?
Answer- The proportion of light reflected by the surface.
Question- What is the point of incidence in the context of the laws of reflection?
Answer- The point of incidence is where the incident ray strikes the reflecting surface.
Question- How does the angle of incidence compare to the angle of reflection?
Answer- The angle of incidence is always equal to the angle of reflection.
Question- What is the role of the normal in reflection?
Answer– The normal is a line drawn perpendicular to the reflecting surface at the point of incidence, used to measure the angles of incidence and reflection.
Question- How does a plane mirror form an image?
Answer– A plane mirror forms a virtual image that is erect, of the same size as the object, and located at the same distance behind the mirror as the object is in front of it.
Question- What is lateral inversion and its practical application?
Answer- Lateral inversion is the phenomenon where the right side of an object appears as the left in the image, used in scenarios like ‘AMBULANCE’ text for correct appearance in rear view mirrors.
Question- What type of images do concave mirrors form when the object is placed very close to them?
Answer– Erect and virtual images.
Question- How do the images formed by convex mirrors differ from those formed by concave mirrors?
Answer- Convex mirrors always form virtual, erect, and diminished images.
Question- What did Sir Isaac Newton discover about white light?
Answer- He discovered that white light is composed of seven different colours.
Question- What is the difference between regular and diffused reflection in terms of image formation?
Answer- Regular reflection forms clear, well-defined images, while diffused reflection does not form clear images.
Question- What natural phenomenon demonstrates the dispersion of light?
Question- What is the primary use of concave mirrors in satellite dishes?
Answer- To gather and focus signals to a specific point.
Question- Why are convex mirrors used in vehicle rearview mirrors?
Answer– They provide a wider field of view.
Question- What type of lenses are used in magnifying glasses and why?
Answer– Convex lenses, for enlarging the appearance of objects.
Question- How does a plane mirror’s height relate to the visibility of a person’s entire image?
Answer- The mirror must be at least half the height of the person.
Question- Why is “AMBULANCE” written in reverse on emergency vehicles?
Answer- To appear correctly in rearview mirrors due to lateral inversion.