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Q.1 4. એક ગોળીય અરીસા અને એક પાતળા ગોળીય લેન્સ દરેકની કેન્દ્રલંબાઈ – 15 cm છે. અરીસો અને લેન્સ હશે:
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Q.2 1. નીચેનાં દ્રવ્યો પૈકી લેન્સ બનાવવા માટે કયા દ્રવ્યનો ઉપયોગ થઈ શકે નહિ ?
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Q.3 3. બહિર્ગોળ લેન્સની સામે વસ્તુને ક્યાં રાખતાં તેનું સાચું અને વસ્તુના પરિમાણ જેટલું જ પ્રતિબિંબ મળે ?
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Q.4 5. અરીસાની સામે તમે ગમે ત્યાં ઊભા રહો છતાં તમારું પ્રતિબિંબ ચત્તું મળે છે, તો આ અરીસો હશે:
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Q.5 2. એક અંતર્ગોળ અરીસા વડે મળતું પ્રતિબિંબ આભાસી, ચત્તું અને વસ્તુ કરતાં મોટું દેખાય છે. વસ્તુનું સ્થાન ક્યાં હશે ?
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Q.6 6. શબ્દકોશમાં જોવા મળતાં નાના અક્ષરોને વાંચવા માટે તમે નીચેના પૈકી કયો લેન્સ પસંદ કરશો ?