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Light travels from more to less optically dense.
The incidence angle is greater than the critical angle.

","mcqOptions":null},{"id":"16791dd6-2569-42af-bca5-8918ee804639","cardType":"cloze","points":null,"front":"At the critical angle, the refracted ray travels [ ].","back":"At the critical angle, the refracted ray travels along the boundary.","mcqOptions":null},{"id":"daf3a5ab-ffd1-4e06-869b-4004afc8d6b3","cardType":"basic","points":2,"front":"Why does a rough surface reflect parallel rays in different directions?","back":"Its differently oriented local normals give different reflection directions.","mcqOptions":null},{"id":"e64ba645-951f-48b3-bb77-aa1a5f887a44","cardType":"basic","points":3,"front":"How do specular and diffuse reflection differ?","back":"

Specular: parallel rays remain parallel.
Diffuse: parallel rays leave in many directions.

","mcqOptions":null},{"id":"62c82e3d-fab5-4fa4-9790-4b76eb5001eb","cardType":"basic","points":2,"front":"Does diffuse reflection obey the law of reflection?","back":"Yes - each ray obeys $i=r$ at its local normal.","mcqOptions":null},{"id":"2e0c818b-1eef-467b-a5ed-071e598d7fc7","cardType":"basic","points":2,"front":"Why can writing on matt paper be read from many positions?","back":"Diffuse reflection sends light in many directions.","mcqOptions":null},{"id":"4dcbfd65-e2e9-49e5-ac1a-235697622a91","cardType":"basic","points":2,"front":"Predict the appearance of a red object under blue light.","back":"It appears very dark because it absorbs most blue light.","mcqOptions":null},{"id":"881536b3-22ce-4180-85fe-930fdf33af1c","cardType":"cloze","points":null,"front":"A colour filter can only transmit wavelengths [ ].","back":"A colour filter can only transmit wavelengths already present in the incident light.","mcqOptions":null},{"id":"ea7c6331-1c9c-4e4d-994d-7dbb103e0be2","cardType":"basic","points":2,"front":"What happens when red light reaches a blue filter?","back":"The red light is absorbed, so little or no light is transmitted.","mcqOptions":null},{"id":"c312942c-ce60-4c01-921c-fb142922d4e3","cardType":"cloze","points":null,"front":"Lens power is calculated using $\\text{[...]}$, with $f$ measured in metres.","back":"Lens power is calculated using $\\boxed{P=\\dfrac{1}{f}}$, with $f$ measured in metres.","mcqOptions":null},{"id":"470f1bbd-2eef-4f0a-b435-60c3b13a204f","cardType":"basic","points":2,"front":"Calculate the power of a converging lens with focal length $0.25\\ \\text{m}$.","back":"$P=+4\\ \\text{D}$.","mcqOptions":null},{"id":"7b145815-690d-4372-8154-0fea661e93fe","cardType":"basic","points":2,"front":"Why does a more strongly curved converging lens have greater power?","back":"It bends rays more strongly, giving a shorter focal length.","mcqOptions":null},{"id":"876e9f4f-31d0-4121-aa07-0c665d6e1897","cardType":"cloze","points":null,"front":"A ray passing through the optical centre of a thin lens continues [ ].","back":"A ray passing through the optical centre of a thin lens continues undeviated.","mcqOptions":null},{"id":"478019d1-eaa0-41e4-a1cc-aa9da0b5190a","cardType":"basic","points":1,"front":"Where does a ray parallel to the principal axis travel after a converging lens?","back":"Through the principal focus on the far side.","mcqOptions":null},{"id":"fa42da4c-a086-4ab8-b776-e07eab8336de","cardType":"basic","points":3,"front":"What image does a diverging lens form for a real object?","back":"A virtual, upright and diminished image between the lens and near focus.","mcqOptions":null},{"id":"3b248f7c-43eb-459d-b854-aa3136cc6798","cardType":"basic","points":3,"front":"What image forms when an object is between $F$ and $2F$ of a converging lens?","back":"A real, inverted and magnified image beyond $2F$.","mcqOptions":null},{"id":"46382d4b-95eb-49a2-85a3-6cc789707244","cardType":"basic","points":3,"front":"How does the screen test distinguish real and virtual images?","back":"A real image can be projected onto a screen; a virtual image cannot.","mcqOptions":null}]}],"examCountdown":{"examDate":"2027-05-25","paperLabel":"Paper 1"},"heading":"5.1 Reflection, refraction and lenses","title":"5.1 Reflection, refraction and lenses (physics only) Flashcards","topbar":{"backHref":"/gcse/physics/edexcel/flashcards"},"topicSidebar":"$L8f"}]}],"topicId":"a2ad4365-b397-5496-acd8-e6d9ce1869aa","walled":"$L90"}],"$L91","$L92"]

5.1 Reflection, refraction and lenses Flashcards

5.1 Reflection, refraction and lenses Flashcards